Root Canal

Root Canal Treatment in Rangsit

Root canal treatment is used to treat inflammation or infection inside a tooth. The procedure removes the affected pulp tissue, cleans and disinfects the root canal system, and seals the space to reduce the risk of further infection.

The purpose of treatment is to retain a natural tooth when it can be restored appropriately, rather than removing it immediately.

At SWC Dental in Rangsit, the dentist evaluates the tooth, surrounding gums, supporting bone and existing restorations before recommending treatment. Root canal treatment is not suitable for every damaged tooth, and the final decision depends on the extent of infection, remaining tooth structure, root condition and long-term restorability.

What Is Root Canal Treatment?

Inside each tooth is a space containing dental pulp. The pulp includes nerves, blood vessels and connective tissue that support the tooth during its development.

Deep decay, cracks, trauma or repeated dental treatment may allow bacteria or irritation to affect this tissue. When the pulp becomes irreversibly inflamed or infected, removing the damaged tissue may be necessary.

During root canal treatment, the dentist:

Creates an opening into the tooth
Removes inflamed or infected pulp tissue
Cleans and shapes the canals inside the roots
Disinfects the canal system
Fills and seals the canals
Restores the opening with a temporary or permanent restoration
Plans a crown or another suitable restoration when required

The tooth remains in the mouth after treatment. Although the pulp is removed, a fully developed tooth can continue functioning because it is supported by the surrounding tissues.

Why Might a Tooth Need Root Canal Treatment?

Root canal treatment may be considered when the pulp inside a tooth is inflamed, infected or no longer able to recover.

Possible causes include:

Deep tooth decay

A cavity may begin in the enamel and gradually progress into deeper tooth structure.

When decay reaches or closely approaches the pulp, bacteria and inflammation may cause persistent pain, infection or loss of pulp vitality.

A smaller cavity may be treated with a dental filling, but deep decay involving the pulp may require root canal treatment before the tooth is restored.

A cracked or fractured tooth

A crack may allow bacteria to enter the inner part of the tooth.

Some cracks affect only the outer tooth structure, while others extend toward the pulp or root. The treatment depends on the location, direction and extent of the crack.

A severely cracked tooth may not always be restorable, even with root canal treatment.

Dental trauma

An impact or accident may damage the pulp even when the tooth does not appear visibly broken.

Symptoms may develop immediately or appear months or years later. A traumatised tooth may change colour, become sensitive, develop swelling or show changes on dental imaging.

Repeated dental procedures

Multiple restorations or repeated procedures on the same tooth may irritate the pulp over time.

This does not mean every heavily restored tooth requires root canal treatment. The dentist considers the symptoms, clinical tests and imaging findings before making a recommendation.

A large or leaking restoration

A large filling or an unsuitable restoration may leave limited healthy tooth structure or allow bacteria to enter around its edges.

If the pulp has become irreversibly damaged, root canal treatment may be needed before a new filling, onlay or dental crown is placed.

Dental infection or abscess

An infection inside the root canal may spread through the end of the root into the surrounding tissues.

This may lead to pain, swelling, tenderness or an abscess. Prompt dental assessment is important because an abscess does not reliably resolve through pain medication alone.

Signs You May Need a Root Canal Assessment

Symptoms that may be associated with an inflamed or infected pulp include:

Persistent toothache
Pain when biting or chewing
Lingering sensitivity to hot or cold
Pain that wakes you at night
Swelling of the gum or face
A small pimple-like swelling on the gum
Tenderness around a specific tooth
A chipped or cracked tooth
Darkening or discolouration of a tooth
A bad taste or discharge near the tooth
A tooth that previously hurt but suddenly stopped hurting
Pain that spreads toward the jaw, ear or neighbouring teeth

These symptoms do not confirm that root canal treatment is required. Tooth pain may also result from gum problems, cracks, sinus-related discomfort, an unsuitable filling, jaw-muscle pain or other conditions.

A dental examination is required to identify the cause.

Can a Tooth Need Root Canal Treatment Without Pain?

Yes. Some teeth with pulp damage or infection may produce little or no noticeable pain.

The condition may instead be identified through:

A dental examination
Changes in tooth colour
A previous history of trauma
Swelling or drainage
An abnormal response to vitality testing
Changes around the root on a dental X-ray
Findings discovered before crown or restorative treatment

The absence of pain does not always mean that the pulp is healthy.

How Is the Tooth Assessed?

Before recommending root canal treatment, the dentist may perform several assessments.

Review of symptoms and history

The dentist asks about:

When the symptoms began
Whether pain is spontaneous or triggered
Sensitivity to hot or cold
Pain during biting
Previous fillings, crowns or dental treatment
Dental trauma
Swelling or drainage
Medication and relevant medical conditions

Clinical examination

The tooth and nearby tissues may be examined for:

Decay
Cracks or fractures
Existing restorations
Swelling
Gum changes
Tooth mobility
Tenderness
Changes in colour
Amount of remaining tooth structure

Sensitivity and pulp tests

Tests may be used to compare the response of the affected tooth with neighbouring teeth.

These tests provide useful information but are interpreted together with symptoms, examination findings and radiographs.

Biting and percussion tests

The dentist may gently tap the tooth or ask the patient to bite on a testing instrument.

Tenderness may indicate inflammation around the root, but it does not by itself confirm the complete diagnosis.

Dental imaging

An intraoral dental X-ray may help assess:

The roots and surrounding bone
The depth of decay
Previous root canal treatment
Changes near the root tip
Root shape
Existing crowns or restorations
Possible complications

A CBCT scan may be considered in selected complex cases when conventional images do not provide sufficient information. It is not required routinely for every root canal treatment.

Root Canal Treatment Process at SWC Dental

The exact procedure depends on the tooth, number of canals, condition of the pulp and complexity of the case.

1. Diagnosis and treatment planning

The dentist reviews the symptoms, clinical tests and dental images.

The patient is informed about:

The condition of the tooth
Whether it appears restorable
Root canal treatment options
Possible alternatives
Need for a crown or other restoration
Potential limitations
Estimated number of appointments
Expected fees

2. Local anaesthesia

Local anaesthesia is normally administered to numb the tooth and surrounding area.

Patients with acute inflammation may require additional anaesthetic techniques. Tell the dentist if you still feel discomfort during the procedure.

3. Isolation of the tooth

A rubber dam may be placed around the tooth.

This thin protective sheet helps:

Keep the treatment area dry
Reduce contamination from saliva
Prevent instruments or materials from entering the mouth
Improve visibility and access

4. Opening the tooth

The dentist creates an opening through the tooth to reach the pulp chamber and root canals.

Existing decay or unsuitable restorative material may also need to be removed.

5. Removing the affected pulp

Inflamed, infected or non-vital tissue is removed from the pulp chamber and root canals.

The dentist locates the canals and evaluates their length and anatomy.

6. Cleaning and shaping the canals

Small instruments are used to clean and shape each canal.

Irrigating solutions may be used to flush debris and support disinfection.

Root canal systems can be narrow, curved or complex. The difficulty varies between front teeth, premolars and molars.

7. Medication or temporary filling when required

Some cases can progress to canal filling during the same appointment.

Other cases may require:

Medication inside the canals
A temporary filling
Time for symptoms or infection to settle
An additional cleaning appointment
Reassessment before final sealing

Patients should return for the scheduled appointment because a temporary filling is not intended to serve as the final restoration.

8. Filling and sealing the canals

Once the canals have been cleaned and prepared, they are filled and sealed with a root canal filling material.

Gutta-percha is commonly used together with a sealing material.

The objective is to fill the prepared canal space and reduce the possibility of bacteria re-entering.

9. Restoring the tooth

After root canal treatment, the opening in the tooth must be restored.

Depending on the amount of remaining tooth structure, the tooth may require:

A permanent filling
An onlay
A core build-up
A post in selected cases
A dental crown

A post does not strengthen the tooth by itself. It may be used to retain a core when insufficient tooth structure remains to support the restoration.

10. Follow-up and review

The dentist may recommend follow-up examinations and dental imaging to monitor healing around the root.

Healing time varies, and changes in the bone may take time to become visible on radiographs.

How Many Appointments Does Root Canal Treatment Require?

Root canal treatment may be completed in one appointment or divided across several visits.

The number of appointments depends on:

Which tooth is being treated
Number and shape of the canals
Presence of infection
Previous root canal treatment
Difficulty locating or cleaning the canals
Symptoms between appointments
Need for medication inside the tooth
Condition of the existing crown or filling
Need for a final restoration

Molars often have more canals and may require more complex treatment than front teeth.

No fixed number of visits should be guaranteed before the tooth has been assessed.

Is Root Canal Treatment Painful?

Local anaesthesia is used during treatment to reduce procedural pain.

Many patients attend because the tooth is already painful from inflammation or infection. The level of discomfort during and after treatment varies according to the condition of the tooth, the procedure and the individual patient.

Some patients may experience temporary:

Tenderness when biting
Mild soreness around the tooth
Gum irritation
Jaw fatigue from keeping the mouth open
Sensitivity around the treated area

These symptoms often improve, but the expected recovery should be discussed for the individual case.

Contact the clinic if pain increases, swelling develops or the bite feels unusually high.

What Should You Expect After Root Canal Treatment?

The mouth may remain numb for several hours after local anaesthesia.

Until normal sensation returns:

Avoid chewing on the numb side
Take care with hot food or drinks
Avoid biting the cheek or tongue
Follow the dentist’s medication instructions
Do not disturb the temporary filling

The tooth may feel different from neighbouring teeth for a short period.

Patients should avoid chewing hard foods on a tooth with a temporary restoration because the tooth may be more vulnerable to fracture.

When Should You Contact the Dentist Urgently?

Contact SWC Dental if you experience:

Increasing facial or gum swelling
Severe pain that does not improve
Fever or feeling generally unwell
Difficulty swallowing
Difficulty breathing
Persistent discharge or a bad taste
A temporary filling that has fallen out
A fractured tooth
Inability to close the teeth comfortably
An allergic reaction to prescribed medication

Difficulty breathing, rapidly increasing swelling or difficulty swallowing may require urgent medical assessment.

Does Every Root Canal-Treated Tooth Need a Crown?

Not every treated tooth automatically requires a crown.

The need depends on:

Which tooth was treated
The amount of remaining tooth structure
Existing cracks
Size of previous fillings
Biting forces
Location in the mouth
Whether the tooth has already fractured
Type of final restoration available

Back teeth commonly experience greater chewing forces and may require cuspal protection with a crown or onlay.

Some front teeth with sufficient healthy structure may be restored with a filling, although each case must be assessed individually.

Why Is the Final Restoration Important?

Root canal treatment treats the tissue inside the tooth, but it does not rebuild missing outer tooth structure.

A suitable final restoration helps:

Seal the access opening
Reduce bacterial leakage
Restore chewing function
Protect weakened tooth structure
Improve the shape and appearance of the tooth

Delaying the permanent restoration may increase the risk of leakage, loss of the temporary filling or tooth fracture.

Root Canal Treatment Compared with Tooth Extraction

Root canal treatment and tooth extraction are different approaches.

Topic	Root canal treatment	Tooth extraction
Main purpose	Treat the inside of the tooth and retain it	Remove the tooth
Natural tooth retained	Yes, when treatment is suitable	No
Final restoration	Filling, onlay or crown may be required	Replacement may be considered
Healing	Tooth and surrounding tissues are monitored	Extraction site must heal
Future treatment	Maintenance of treated tooth	Implant, bridge or denture may be considered
Suitability	Requires a restorable tooth	May be selected when retention is unsuitable

Saving a natural tooth may be appropriate when it has adequate support and can be restored predictably.

Extraction may be considered when:

The tooth has a non-restorable fracture
Too little healthy structure remains
Severe periodontal support has been lost
The root is significantly damaged
Previous treatment cannot be predictably managed
The tooth creates an ongoing risk that cannot be controlled
The patient selects extraction after discussing alternatives

Removing a tooth does not always complete treatment. Replacement with a dental implant, dental bridge or denture may be considered to restore function.

What Is Root Canal Retreatment?

A tooth that has already received root canal treatment may sometimes develop persistent symptoms or a new infection.

Possible contributing factors include:

Complex canal anatomy
A canal that was not previously treated
Leakage around the restoration
New tooth decay
A cracked tooth
Delayed placement of the final restoration
Breakdown of an existing crown or filling
Contamination after treatment

Retreatment involves reopening the tooth, removing previous root filling material, cleaning the canals again and resealing them where possible.

Not every previously treated tooth is suitable for retreatment. Endodontic surgery or extraction may be considered in selected cases.

Can Antibiotics Replace Root Canal Treatment?

Antibiotics do not remove infected or damaged pulp tissue from inside the root canal system.

They may be prescribed in selected cases when infection has spread or when the patient has systemic signs, but they are not a substitute for treating the source of the infection.

The dentist will decide whether medication is appropriate based on the symptoms and clinical condition.

Patients should not use leftover antibiotics or medication prescribed for another person.

Can a Root Canal-Treated Tooth Become Infected Again?

Reinfection may occur if bacteria gain access to the root canal system again.

Possible causes include:

New tooth decay
A leaking filling or crown
A fractured tooth
Delayed final restoration
Complex untreated anatomy
Breakdown of an existing restoration
Gum or bone problems
Trauma

Regular dental examinations and appropriate restoration maintenance remain important after treatment.

How Long Does a Root Canal-Treated Tooth Last?

There is no fixed lifespan that applies to every treated tooth.

Long-term function depends on factors such as:

Original condition of the tooth
Quality and complexity of the root canal treatment
Remaining tooth structure
Type and timing of the final restoration
Gum and bone support
New tooth decay
Biting forces
Grinding or clenching
Oral hygiene
Regular maintenance
Future trauma or fractures

A treated tooth may function for many years when it is appropriately restored and maintained, but no outcome should be guaranteed for every patient.

Caring for a Root Canal-Treated Tooth

After the final restoration has been completed:

Brush twice daily with fluoride toothpaste
Clean between the teeth every day
Attend recommended dental examinations
Maintain professional teeth cleaning appointments
Avoid chewing ice or hard objects
Report a loose crown or filling
Seek assessment if pain, swelling or sensitivity returns
Use a protective appliance if prescribed for grinding
Maintain gum health around the tooth
Reduce frequent sugary snacks and drinks

The tooth can still develop decay around a filling or crown even though the pulp has been removed.

Root Canal Treatment in Rangsit at SWC Dental

SWC Dental provides root canal assessment and treatment for patients in Rangsit, Pathum Thani and nearby areas, including Thanyaburi, Khlong Luang, Lam Luk Ka and Don Mueang.

The process begins with an examination, clinical testing and suitable dental imaging. The dentist evaluates whether the tooth can be retained and what restoration may be needed after the canal treatment.

Related services may include:

The treatment approach, number of appointments, restorative requirements and fees depend on the condition of the tooth and the individual assessment.

Frequently Asked Questions About Root Canal Treatment

What is removed during root canal treatment?

The dentist removes inflamed, infected or non-vital pulp tissue from inside the tooth. The canals are then cleaned, shaped, filled and sealed.

Is the tooth dead after root canal treatment?

The pulp tissue inside the tooth is removed, but the tooth remains supported by the surrounding gum, periodontal ligament and bone. It can continue to function when properly restored.

Does a root canal hurt?

Local anaesthesia is normally used during the procedure. Some patients may experience temporary tenderness or soreness afterward. The experience varies according to the tooth and the condition being treated.

How many visits will I need?

Treatment may require one or several appointments. The number depends on the tooth, canal anatomy, presence of infection and complexity of treatment.

Will I need a crown afterward?

A crown or onlay may be recommended when the tooth has lost substantial structure or needs protection from chewing forces. Some teeth may be restored with a filling instead.

Can I eat after root canal treatment?

Wait until the numbness has worn off before chewing to reduce the risk of biting your cheek or tongue. Avoid hard foods on a tooth with a temporary filling.

Why does my tooth still hurt after treatment?

Temporary tenderness may occur as the surrounding tissues recover. Increasing pain, swelling, an uneven bite or symptoms that do not improve should be assessed by the dentist.

Can an infected tooth heal without root canal treatment?

Once the pulp is irreversibly inflamed or infected, it does not normally recover through brushing, pain medicine or antibiotics alone. Treatment may involve root canal therapy or extraction depending on whether the tooth can be retained.

Is extraction better than root canal treatment?

Neither option is automatically better for every patient. Root canal treatment may retain a restorable natural tooth, while extraction may be appropriate when the tooth cannot be predictably saved.

Can a root canal fail?

Persistent or recurrent disease can occur. Depending on the cause and condition of the tooth, options may include retreatment, endodontic surgery, monitoring or extraction.

Book a Root Canal Assessment

If you have persistent tooth pain, sensitivity, swelling, pain when biting or a cracked tooth, arrange a dental assessment at SWC Dental in Rangsit.

The dentist will examine the tooth, review suitable dental images and discuss whether root canal treatment, restoration, extraction or another option is appropriate.

View the dental treatment fees or contact SWC Dental to arrange an appointment.

The purpose of treatment is to retain a natural tooth when it can be restored appropriately, rather than removing it immediately.

What Is Root Canal Treatment?

Inside each tooth is a space containing dental pulp. The pulp includes nerves, blood vessels and connective tissue that support the tooth during its development.

During root canal treatment, the dentist:

Creates an opening into the tooth
Removes inflamed or infected pulp tissue
Cleans and shapes the canals inside the roots
Disinfects the canal system
Fills and seals the canals
Restores the opening with a temporary or permanent restoration
Plans a crown or another suitable restoration when required

The tooth remains in the mouth after treatment. Although the pulp is removed, a fully developed tooth can continue functioning because it is supported by the surrounding tissues.

Why Might a Tooth Need Root Canal Treatment?

Root canal treatment may be considered when the pulp inside a tooth is inflamed, infected or no longer able to recover.

Possible causes include:

Deep tooth decay

A cavity may begin in the enamel and gradually progress into deeper tooth structure.

When decay reaches or closely approaches the pulp, bacteria and inflammation may cause persistent pain, infection or loss of pulp vitality.

A smaller cavity may be treated with a dental filling, but deep decay involving the pulp may require root canal treatment before the tooth is restored.

A cracked or fractured tooth

A crack may allow bacteria to enter the inner part of the tooth.

Some cracks affect only the outer tooth structure, while others extend toward the pulp or root. The treatment depends on the location, direction and extent of the crack.

A severely cracked tooth may not always be restorable, even with root canal treatment.

Dental trauma

An impact or accident may damage the pulp even when the tooth does not appear visibly broken.

Symptoms may develop immediately or appear months or years later. A traumatised tooth may change colour, become sensitive, develop swelling or show changes on dental imaging.

Repeated dental procedures

Multiple restorations or repeated procedures on the same tooth may irritate the pulp over time.

This does not mean every heavily restored tooth requires root canal treatment. The dentist considers the symptoms, clinical tests and imaging findings before making a recommendation.

A large or leaking restoration

A large filling or an unsuitable restoration may leave limited healthy tooth structure or allow bacteria to enter around its edges.

If the pulp has become irreversibly damaged, root canal treatment may be needed before a new filling, onlay or dental crown is placed.

Dental infection or abscess

An infection inside the root canal may spread through the end of the root into the surrounding tissues.

This may lead to pain, swelling, tenderness or an abscess. Prompt dental assessment is important because an abscess does not reliably resolve through pain medication alone.

Signs You May Need a Root Canal Assessment

Symptoms that may be associated with an inflamed or infected pulp include:

Persistent toothache
Pain when biting or chewing
Lingering sensitivity to hot or cold
Pain that wakes you at night
Swelling of the gum or face
A small pimple-like swelling on the gum
Tenderness around a specific tooth
A chipped or cracked tooth
Darkening or discolouration of a tooth
A bad taste or discharge near the tooth
A tooth that previously hurt but suddenly stopped hurting
Pain that spreads toward the jaw, ear or neighbouring teeth

A dental examination is required to identify the cause.

Can a Tooth Need Root Canal Treatment Without Pain?

Yes. Some teeth with pulp damage or infection may produce little or no noticeable pain.

The condition may instead be identified through:

A dental examination
Changes in tooth colour
A previous history of trauma
Swelling or drainage
An abnormal response to vitality testing
Changes around the root on a dental X-ray
Findings discovered before crown or restorative treatment

The absence of pain does not always mean that the pulp is healthy.

How Is the Tooth Assessed?

Before recommending root canal treatment, the dentist may perform several assessments.

Review of symptoms and history

The dentist asks about:

When the symptoms began
Whether pain is spontaneous or triggered
Sensitivity to hot or cold
Pain during biting
Previous fillings, crowns or dental treatment
Dental trauma
Swelling or drainage
Medication and relevant medical conditions

Clinical examination

The tooth and nearby tissues may be examined for:

Decay
Cracks or fractures
Existing restorations
Swelling
Gum changes
Tooth mobility
Tenderness
Changes in colour
Amount of remaining tooth structure

Sensitivity and pulp tests

Tests may be used to compare the response of the affected tooth with neighbouring teeth.

These tests provide useful information but are interpreted together with symptoms, examination findings and radiographs.

Biting and percussion tests

The dentist may gently tap the tooth or ask the patient to bite on a testing instrument.

Tenderness may indicate inflammation around the root, but it does not by itself confirm the complete diagnosis.

Dental imaging

An intraoral dental X-ray may help assess:

The roots and surrounding bone
The depth of decay
Previous root canal treatment
Changes near the root tip
Root shape
Existing crowns or restorations
Possible complications

A CBCT scan may be considered in selected complex cases when conventional images do not provide sufficient information. It is not required routinely for every root canal treatment.

Root Canal Treatment Process at SWC Dental

The exact procedure depends on the tooth, number of canals, condition of the pulp and complexity of the case.

1. Diagnosis and treatment planning

The dentist reviews the symptoms, clinical tests and dental images.

The patient is informed about:

The condition of the tooth
Whether it appears restorable
Root canal treatment options
Possible alternatives
Need for a crown or other restoration
Potential limitations
Estimated number of appointments
Expected fees

2. Local anaesthesia

Local anaesthesia is normally administered to numb the tooth and surrounding area.

Patients with acute inflammation may require additional anaesthetic techniques. Tell the dentist if you still feel discomfort during the procedure.

3. Isolation of the tooth

A rubber dam may be placed around the tooth.

This thin protective sheet helps:

Keep the treatment area dry
Reduce contamination from saliva
Prevent instruments or materials from entering the mouth
Improve visibility and access

4. Opening the tooth

The dentist creates an opening through the tooth to reach the pulp chamber and root canals.

Existing decay or unsuitable restorative material may also need to be removed.

5. Removing the affected pulp

Inflamed, infected or non-vital tissue is removed from the pulp chamber and root canals.

The dentist locates the canals and evaluates their length and anatomy.

6. Cleaning and shaping the canals

Small instruments are used to clean and shape each canal.

Irrigating solutions may be used to flush debris and support disinfection.

Root canal systems can be narrow, curved or complex. The difficulty varies between front teeth, premolars and molars.

7. Medication or temporary filling when required

Some cases can progress to canal filling during the same appointment.

Other cases may require:

Medication inside the canals
A temporary filling
Time for symptoms or infection to settle
An additional cleaning appointment
Reassessment before final sealing

Patients should return for the scheduled appointment because a temporary filling is not intended to serve as the final restoration.

8. Filling and sealing the canals

Once the canals have been cleaned and prepared, they are filled and sealed with a root canal filling material.

Gutta-percha is commonly used together with a sealing material.

The objective is to fill the prepared canal space and reduce the possibility of bacteria re-entering.

9. Restoring the tooth

After root canal treatment, the opening in the tooth must be restored.

Depending on the amount of remaining tooth structure, the tooth may require:

A permanent filling
An onlay
A core build-up
A post in selected cases
A dental crown

A post does not strengthen the tooth by itself. It may be used to retain a core when insufficient tooth structure remains to support the restoration.

10. Follow-up and review

The dentist may recommend follow-up examinations and dental imaging to monitor healing around the root.

Healing time varies, and changes in the bone may take time to become visible on radiographs.

How Many Appointments Does Root Canal Treatment Require?

Root canal treatment may be completed in one appointment or divided across several visits.

The number of appointments depends on:

Which tooth is being treated
Number and shape of the canals
Presence of infection
Previous root canal treatment
Difficulty locating or cleaning the canals
Symptoms between appointments
Need for medication inside the tooth
Condition of the existing crown or filling
Need for a final restoration

Molars often have more canals and may require more complex treatment than front teeth.

No fixed number of visits should be guaranteed before the tooth has been assessed.

Is Root Canal Treatment Painful?

Local anaesthesia is used during treatment to reduce procedural pain.

Some patients may experience temporary:

Tenderness when biting
Mild soreness around the tooth
Gum irritation
Jaw fatigue from keeping the mouth open
Sensitivity around the treated area

These symptoms often improve, but the expected recovery should be discussed for the individual case.

Contact the clinic if pain increases, swelling develops or the bite feels unusually high.

What Should You Expect After Root Canal Treatment?

The mouth may remain numb for several hours after local anaesthesia.

Until normal sensation returns:

Avoid chewing on the numb side
Take care with hot food or drinks
Avoid biting the cheek or tongue
Follow the dentist’s medication instructions
Do not disturb the temporary filling

The tooth may feel different from neighbouring teeth for a short period.

Patients should avoid chewing hard foods on a tooth with a temporary restoration because the tooth may be more vulnerable to fracture.

When Should You Contact the Dentist Urgently?

Contact SWC Dental if you experience:

Increasing facial or gum swelling
Severe pain that does not improve
Fever or feeling generally unwell
Difficulty swallowing
Difficulty breathing
Persistent discharge or a bad taste
A temporary filling that has fallen out
A fractured tooth
Inability to close the teeth comfortably
An allergic reaction to prescribed medication

Difficulty breathing, rapidly increasing swelling or difficulty swallowing may require urgent medical assessment.

Does Every Root Canal-Treated Tooth Need a Crown?

Not every treated tooth automatically requires a crown.

The need depends on:

Which tooth was treated
The amount of remaining tooth structure
Existing cracks
Size of previous fillings
Biting forces
Location in the mouth
Whether the tooth has already fractured
Type of final restoration available

Back teeth commonly experience greater chewing forces and may require cuspal protection with a crown or onlay.

Some front teeth with sufficient healthy structure may be restored with a filling, although each case must be assessed individually.

Why Is the Final Restoration Important?

Root canal treatment treats the tissue inside the tooth, but it does not rebuild missing outer tooth structure.

A suitable final restoration helps:

Seal the access opening
Reduce bacterial leakage
Restore chewing function
Protect weakened tooth structure
Improve the shape and appearance of the tooth

Delaying the permanent restoration may increase the risk of leakage, loss of the temporary filling or tooth fracture.

Root Canal Treatment Compared with Tooth Extraction

Root canal treatment and tooth extraction are different approaches.

Topic	Root canal treatment	Tooth extraction
Main purpose	Treat the inside of the tooth and retain it	Remove the tooth
Natural tooth retained	Yes, when treatment is suitable	No
Final restoration	Filling, onlay or crown may be required	Replacement may be considered
Healing	Tooth and surrounding tissues are monitored	Extraction site must heal
Future treatment	Maintenance of treated tooth	Implant, bridge or denture may be considered
Suitability	Requires a restorable tooth	May be selected when retention is unsuitable

Saving a natural tooth may be appropriate when it has adequate support and can be restored predictably.

Extraction may be considered when:

The tooth has a non-restorable fracture
Too little healthy structure remains
Severe periodontal support has been lost
The root is significantly damaged
Previous treatment cannot be predictably managed
The tooth creates an ongoing risk that cannot be controlled
The patient selects extraction after discussing alternatives

Removing a tooth does not always complete treatment. Replacement with a dental implant, dental bridge or denture may be considered to restore function.

What Is Root Canal Retreatment?

A tooth that has already received root canal treatment may sometimes develop persistent symptoms or a new infection.

Possible contributing factors include:

Complex canal anatomy
A canal that was not previously treated
Leakage around the restoration
New tooth decay
A cracked tooth
Delayed placement of the final restoration
Breakdown of an existing crown or filling
Contamination after treatment

Retreatment involves reopening the tooth, removing previous root filling material, cleaning the canals again and resealing them where possible.

Not every previously treated tooth is suitable for retreatment. Endodontic surgery or extraction may be considered in selected cases.

Can Antibiotics Replace Root Canal Treatment?

Antibiotics do not remove infected or damaged pulp tissue from inside the root canal system.

They may be prescribed in selected cases when infection has spread or when the patient has systemic signs, but they are not a substitute for treating the source of the infection.

The dentist will decide whether medication is appropriate based on the symptoms and clinical condition.

Patients should not use leftover antibiotics or medication prescribed for another person.

Can a Root Canal-Treated Tooth Become Infected Again?

Reinfection may occur if bacteria gain access to the root canal system again.

Possible causes include:

New tooth decay
A leaking filling or crown
A fractured tooth
Delayed final restoration
Complex untreated anatomy
Breakdown of an existing restoration
Gum or bone problems
Trauma

Regular dental examinations and appropriate restoration maintenance remain important after treatment.

How Long Does a Root Canal-Treated Tooth Last?

There is no fixed lifespan that applies to every treated tooth.

Long-term function depends on factors such as:

Original condition of the tooth
Quality and complexity of the root canal treatment
Remaining tooth structure
Type and timing of the final restoration
Gum and bone support
New tooth decay
Biting forces
Grinding or clenching
Oral hygiene
Regular maintenance
Future trauma or fractures

A treated tooth may function for many years when it is appropriately restored and maintained, but no outcome should be guaranteed for every patient.

Caring for a Root Canal-Treated Tooth

After the final restoration has been completed:

Brush twice daily with fluoride toothpaste
Clean between the teeth every day
Attend recommended dental examinations
Maintain professional teeth cleaning appointments
Avoid chewing ice or hard objects
Report a loose crown or filling
Seek assessment if pain, swelling or sensitivity returns
Use a protective appliance if prescribed for grinding
Maintain gum health around the tooth
Reduce frequent sugary snacks and drinks

The tooth can still develop decay around a filling or crown even though the pulp has been removed.

Root Canal Treatment in Rangsit at SWC Dental

SWC Dental provides root canal assessment and treatment for patients in Rangsit, Pathum Thani and nearby areas, including Thanyaburi, Khlong Luang, Lam Luk Ka and Don Mueang.

Related services may include:

The treatment approach, number of appointments, restorative requirements and fees depend on the condition of the tooth and the individual assessment.

Frequently Asked Questions About Root Canal Treatment

What is removed during root canal treatment?

The dentist removes inflamed, infected or non-vital pulp tissue from inside the tooth. The canals are then cleaned, shaped, filled and sealed.

Is the tooth dead after root canal treatment?

The pulp tissue inside the tooth is removed, but the tooth remains supported by the surrounding gum, periodontal ligament and bone. It can continue to function when properly restored.

Does a root canal hurt?

How many visits will I need?

Treatment may require one or several appointments. The number depends on the tooth, canal anatomy, presence of infection and complexity of treatment.

Will I need a crown afterward?

A crown or onlay may be recommended when the tooth has lost substantial structure or needs protection from chewing forces. Some teeth may be restored with a filling instead.

Can I eat after root canal treatment?

Wait until the numbness has worn off before chewing to reduce the risk of biting your cheek or tongue. Avoid hard foods on a tooth with a temporary filling.

Why does my tooth still hurt after treatment?

Temporary tenderness may occur as the surrounding tissues recover. Increasing pain, swelling, an uneven bite or symptoms that do not improve should be assessed by the dentist.

Can an infected tooth heal without root canal treatment?

Is extraction better than root canal treatment?

Neither option is automatically better for every patient. Root canal treatment may retain a restorable natural tooth, while extraction may be appropriate when the tooth cannot be predictably saved.

Can a root canal fail?

Persistent or recurrent disease can occur. Depending on the cause and condition of the tooth, options may include retreatment, endodontic surgery, monitoring or extraction.

Book a Root Canal Assessment

If you have persistent tooth pain, sensitivity, swelling, pain when biting or a cracked tooth, arrange a dental assessment at SWC Dental in Rangsit.

The dentist will examine the tooth, review suitable dental images and discuss whether root canal treatment, restoration, extraction or another option is appropriate.

View the dental treatment fees or contact SWC Dental to arrange an appointment.

Root canal treatment is a treatment to repair and save a badly damaged or infected tooth instead of removing it.

	Reasons why you may require root canal treatment.
1.Deep Decay	At first, decay may go unnoticed, effecting only the outer enamel of the teeth. Over time, the decay progresses to the deeper layers of tooth, and eventually damages the pulp.
2.Repeat Procedures	Repeated dental procedures performed on a single tooth increases its risk for future root canal treatment. Reoccurring cavities may require that a tooth be filled, the filling removed to remove new decay, and filled again. This may occur if the tooth becomes cracked, chipped, or broken due to trauma or an accident.
3.Large Fillings	Not only does a large filling affect the structural integrity of a tooth, it can also increase your risk for root canal treatment. If the decay or filling reaches the pulp, inflammation or infection may develop.
4.Cracks/Chips	Cracks, chips, and other types of trauma are often the cause of a root canal procedure.

Steps of root canal treatment (depending on the situation)

X-rays of affected tooth are examined, then local anesthesia is administered to the tooth.
The endodontist makes an opening through the tooth to remove the diseased pulp (pulpectomy)
The pulp chamber and root canals are cleaned and shaped in preparation for a filling.
Root canals are filled with gutta percha material.
If more than one visit is needed, temporary filling is placed in the crown opening to protect the tooth between visit. Temporary filling is removed and pulp chamber and root canal are permanently filled with gutta percha into each canals and is sealed in place with cement. Sometimes a metal or plastic rod is placed in the canal for structural support. In the final step, a crown is usually placed over the tooth to restore its natural shape and appearance. If the tooth is broken, a post may be required to build it up prior to placing a crown.

Is it painful?

Many people worry that a root canal will be painful. A root canal is as comfortable as getting a filling. An infected tooth (pre-root canal), is usually what causes tooth pain, and a root canal is the solution to this problem. In fact, infected tooth pulp can cause a tooth abscess and can destroy the bone surrounding the tooth.

A treated and restored tooth can last a lifetime with proper care. Root canals have a high success rate and are significantly less expensive than the alternative, tooth extraction and replacement with a bridge or implant.
But tooth decay can still occur in treated teeth, so good oral hygiene and regular dental exams are necessary to prevent further problems.