Treatment guide

Root canal treatment

Root canal treatment removes inflamed or infected pulp, cleans and seals the canal system and is usually followed by an appropriate restoration to protect the tooth.

Relieve disease inside a tooth and retain a tooth that is restorable and adequately supported. Complete the final restoration promptly as directed and maintain routine dental care.

Updated August 20, 2026Not clinically reviewed · status

Part of More on Treatments. Related: Clear aligners · Traditional braces guide · Full-mouth rehabilitation explained · Sedation dentistry guide

Direct answer

What this treatment is for

Relieve disease inside a tooth and retain a tooth that is restorable and adequately supported.

Treatment pathway

What the complete sequence may include

  1. 1

    Diagnosis and restorability assessment

  2. 2

    Anesthesia and isolation

  3. 3

    Cleaning, shaping and disinfection

  4. 4

    Canal filling and seal

  5. 5

    Definitive restoration and follow-up

What affects candidacy and planning

Whether the tooth can be predictably restored

Root anatomy and prior treatment

Fracture pattern

Bone and periodontal support

Tradeoffs and limitations

  • Treatment does not repair an unrestorable fracture
  • A final crown or other restoration may still be needed
  • Persistent or recurrent disease can require retreatment, surgery or extraction

Alternatives worth asking about

  • Extraction with replacement planning
  • Monitoring only when a clinician finds it appropriate
  • Endodontic surgery or retreatment for selected prior treatments

Maintenance is part of treatment

Complete the final restoration promptly as directed and maintain routine dental care.

Full explanation

What root canal treatment involves

Root canal treatment removes infected or irreversibly inflamed tissue from inside a tooth, cleans and shapes the canal system, and seals it so bacteria cannot re-establish. The aim is to keep a natural tooth that would otherwise need removing. The pulp, the nerve and blood supply inside the tooth, sits in a branching network of canals that varies between teeth and between people, which is why some teeth are straightforward and others are genuinely complex. Treatment is carried out under local anesthetic with the tooth isolated behind a rubber dam so the canals stay clean. Once completed the tooth no longer has a nerve supply, becomes more brittle, and back teeth usually need a crown or onlay to protect them from splitting. The restoration afterwards is not an optional extra; it is part of whether the treatment succeeds.

Also called: endodontic treatment, root canal therapy, RCT, nerve treatment.

Why it comes up

Reasons this treatment is usually considered

  • Decay or a fracture has reached the pulp and the nerve is irreversibly inflamed
  • A tooth has developed an abscess or persistent infection at the root tip
  • A tooth has died following trauma, sometimes years afterwards
  • A deep restoration has been placed and the nerve has not settled
  • A tooth needs to be kept as a bridge abutment or denture support and the pulp is compromised

Variants

Types that change the plan, the sequence or the cost

ItemDetail
Primary root canal treatmentFirst-time treatment of a tooth. Complexity varies enormously with the number and shape of the canals: a single-canal front tooth and a curved molar with four canals are different procedures with different fees.
Root canal retreatmentRedoing previous treatment where infection persists or has recurred. Requires removing the existing filling material and any post, so it is more involved than primary treatment.
PulpotomyRemoval of only the coronal part of the pulp, leaving the rest vital. Used in specific situations, particularly in children's teeth and in some immature adult teeth.
ApicoectomyA surgical approach through the gum to the root tip, used where infection persists and conventional retreatment is not possible or has not worked.
Emergency pulpotomy or openingA first-visit procedure to relieve severe pain by removing inflamed tissue, with definitive treatment completed later.

Visit by visit

What actually happens at each appointment

StepDetail
1. DiagnosisExamination, sensitivity testing and radiographs, sometimes with a CBCT scan for complex anatomy or persistent problems. Diagnosis identifies which tooth and whether the pulp is genuinely irreversibly damaged.
2. Access and cleaningLocal anesthetic, rubber dam isolation, an opening made through the crown, and the canal system located, cleaned and shaped with irrigation. Some teeth are completed in one visit; others are dressed with medication and left.
3. Interim dressingWhere treatment is staged, a medicament is sealed inside and a temporary filling placed. The temporary must stay intact: losing it allows contamination back into the cleaned canals.
4. Filling the canalsThe canal system is sealed, usually with gutta-percha and a sealer, and a radiograph confirms the fill. This is the point at which the endodontic phase is complete.
5. Definitive restorationA permanent filling, onlay or crown depending on how much tooth remains. This must not be left indefinitely; a temporary filling is not a long-term seal.
6. ReviewFollow-up, often with a radiograph after an interval, to confirm that healing at the root tip is progressing.

How to prepare before the first appointment

  1. Ask whether the tooth is restorable before agreeing to root canal treatment: the two decisions belong together
  2. Ask whether a crown or onlay will be needed afterwards and get that cost at the same time, not later
  3. Ask whether treatment will be one visit or two, and what the temporary arrangement is in between
  4. Ask whether a general dentist or an endodontist is the appropriate person for this tooth's anatomy
  5. Arrange the definitive restoration appointment when you book the root canal, so the tooth is not left in a temporary for months

Afterwards

Recovery, described in phases

ItemDetail
First 24–48 hoursTenderness to biting is common as the tissue around the root tip settles, particularly where there was infection beforehand. Practices normally advise chewing on the other side until the definitive restoration is placed.
The first weekDiscomfort usually reduces. A flare-up with increased swelling or pain can occur and should be reported, not waited out.
While in the temporaryAvoid heavy chewing on that tooth. The tooth is weakest at this stage and splitting a root-treated tooth before it is protected can make it unrestorable.
After the definitive restorationThe tooth should function normally. Tenderness that persists for weeks after the final restoration, or that returns later, warrants reassessment instead of assuming it is normal.

Healing is individual. Follow the written instructions from the treating practice over any general timeline, including this one.

Honest limitations

Complications and what influences them

!

Persistent or recurrent infection. Complex canal anatomy, a missed canal or a coronal seal that has leaked can allow infection to persist. Managed by retreatment or, in some cases, surgery.

!

Tooth fracture. A root-treated tooth has lost structure and is more brittle. Back teeth left unprotected in a temporary or a plain filling are at real risk of splitting, sometimes unrestorably.

!

Instrument separation. A fine instrument can fracture inside a canal. Depending on where it sits, it may be retrievable, bypassable, or left in place and monitored. It does not automatically mean the tooth is lost.

!

Perforation. An opening made through the side of the root or the floor of the chamber. Repairable in some situations; the prognosis depends on the site and how quickly it is sealed.

!

Missed canal anatomy. Teeth vary, and additional canals are not always visible on a standard radiograph. This is a common reason treatment fails and a common reason CBCT imaging or specialist referral is suggested.

!

Discoloration. A root-treated front tooth can darken over time. Internal bleaching, a veneer or a crown are the usual responses, and each is a separate procedure.

What genuinely affects the outcome

  • Placing the definitive restoration promptly instead of leaving the tooth in a temporary
  • Protecting a back tooth with a cuspal-coverage restoration where the clinician advises it
  • A well-sealed restoration margin, because leakage from above is a major cause of later failure
  • Adequate cleaning of the whole canal system, which is why anatomy drives referral decisions
  • Attending the review radiograph so healing at the root tip is actually confirmed
  • Managing grinding, which loads an already weakened tooth

Complete cost

Line items that belong in an itemized estimate

01

Diagnosis, sensitivity testing and radiographs

02

CBCT imaging, where anatomy or a persistent problem justifies it

03

The root canal treatment itself, priced by tooth type, front teeth, premolars and molars differ

04

Any emergency appointment to relieve pain before definitive treatment

05

Temporary filling and any interim dressing visit

06

Core build-up after treatment

07

The definitive restoration, filling, onlay or crown, which is a separate fee

08

Review appointments and follow-up radiographs

09

Retreatment or surgery if the initial treatment does not resolve the problem

Benefits

How dental plans commonly treat this

  • Root canal treatment is commonly classified as a basic or major service depending on the plan, which changes the payment percentage
  • The fee usually varies by tooth type, and plans generally recognize that distinction
  • The crown or onlay afterwards is a separate benefit with its own rules, and may be assessed under a different category
  • Retreatment may be limited by frequency rules or excluded within a certain period of the original treatment
  • A waiting period can apply on newer policies before major services are available
  • Where root canal treatment and a crown fall in one benefit year, the annual maximum is frequently reached

Second-opinion triggers

What should make you pause before agreeing

!

Root canal treatment proposed without first establishing that the tooth is restorable afterwards

!

No plan or price given for the crown or onlay that will be needed

!

A tooth left in a temporary filling for months with no restoration appointment booked

!

No radiograph taken, or no explanation of what it shows

!

Extraction and an implant recommended immediately, with no discussion of whether the tooth could be saved

!

Persistent symptoms dismissed without reassessment after treatment is complete

Long-term care once treatment is finished

  1. Get the definitive restoration placed within the timeframe advised, not months later
  2. Avoid heavy chewing on the tooth while it is still in a temporary
  3. Attend the review radiograph even if the tooth feels completely fine
  4. Report returning pain, swelling or tenderness to biting, not assuming treatment has failed or that nothing can be done
  5. Wear a night appliance if grinding has been identified, since a root-treated tooth is more brittle

Questions people ask

Root canal treatment: direct answers

01

Is root canal treatment painful?

The procedure is carried out under local anesthetic, and the reputation it has largely predates modern anesthesia and technique. What people often remember as the pain of a root canal is usually the pain of the infection or irreversible pulpitis that led to it, which the treatment is intended to relieve. Tenderness to biting for a few days afterwards is common, particularly where there was infection beforehand. Severe or increasing pain afterwards is not expected and should be reported.

02

Should I just have the tooth pulled instead?

That is a legitimate comparison and deserves a real answer instead of a reflex. Keeping a natural tooth preserves the root in the bone and avoids the replacement question entirely. Extraction is simpler and cheaper on the day, but the space then needs managing, with an implant, a bridge, a denture, or a decision to leave it and monitor, and those carry their own cost and timeline. The decision usually turns on whether the tooth is restorable and what its long-term prognosis is. See our comparison of root canal treatment and extraction.

03

Why do I need a crown after a root canal?

A root-treated back tooth has lost structure both to the original decay or fracture and to the access opening made during treatment, and it no longer has its internal blood supply, which makes it more brittle. Under chewing forces it is at real risk of splitting, and a split root is frequently unrestorable. A crown or onlay covers the cusps and holds the tooth together. Front teeth with minimal structural loss are sometimes restored without one, so it should be explained for your specific tooth.

04

How many appointments does root canal treatment take?

Some teeth are completed in a single visit and others are treated over two, with a medicated dressing in between. The choice depends on the anatomy, whether there is active infection, how much time the canal system needs, and clinical judgment about the individual case. Neither approach is universally superior. What matters more is that the definitive restoration is placed promptly afterwards instead of the tooth being left in a temporary filling indefinitely.

05

What is the difference between a general dentist and an endodontist for this?

An endodontist is a dentist with additional specialist training focused on the inside of the tooth, and typically works with magnification and equipment suited to complex canal anatomy. Many root canals are treated perfectly well by general dentists. Referral tends to be suggested where the anatomy is complicated, where a previous treatment needs redoing, where there is unusual pain, or where access is difficult. It is reasonable to ask why a particular tooth is or is not being referred.

06

Can a root canal fail years later?

Yes. Late failure is usually caused by bacteria re-entering the canal system, most often through a leaking restoration margin or a new area of decay, or by a canal that could not be fully cleaned during the original treatment. Sometimes it is a fracture, not an infection. Options then include retreatment, surgery at the root tip, or extraction. Late failure can be painless for a long time, which is why review radiographs are worth attending.

07

Will my tooth go dark after a root canal?

It can, particularly a front tooth, because the tooth no longer has its internal blood supply and pigment from the pulp chamber can discolor the dentine. This is a cosmetic instead of a structural problem. Internal bleaching, a veneer or a crown are the usual approaches, each a separate procedure with its own cost. If the tooth is visible when you smile, it is worth raising discoloration before treatment so it is planned for instead of dealt with later.

08

How do I know if I actually need a root canal?

Diagnosis relies on symptoms, sensitivity testing, examination and radiographs, and sometimes on how a tooth behaves over time. Lingering pain to hot or cold, spontaneous pain, pain that wakes you, tenderness to biting, swelling, or a tooth that has darkened are the patterns that commonly lead to it. None of them can be confirmed from a description alone, and a tooth can also be symptom-free while showing infection on a radiograph. If you are unsure, a second opinion with your radiographs is reasonable.

09

Can I have a root canal while pregnant?

Dental infection is itself a risk, so the decision is generally about timing and precautions, not an outright prohibition. Practices routinely take account of pregnancy in relation to radiographs, anesthetic choice and positioning, and will liaise with the medical team where necessary. What matters is telling the practice you are pregnant and how far along, so the plan accounts for it. Our guide on dental treatment during pregnancy covers what usually gets adjusted.

10

What happens if I do nothing?

An irreversibly inflamed or infected pulp does not recover on its own. The usual course is that infection progresses into the bone at the root tip, which can produce an abscess, swelling and pain, and in some cases spreading infection that becomes a medical urgency. Pain may come and go, and a quiet period does not mean the problem has resolved. The nerve tissue may simply have died. Deferring treatment tends to reduce the chance that the tooth can be kept.

11

Why does a molar cost more to treat than a front tooth?

Fee schedules recognize tooth type because the anatomy differs: a front tooth usually has one canal, while a molar can have three or four, often curved, which takes longer to locate, clean and shape safely. Some plans and providers price by canal count instead of a flat per-tooth fee, so ask which basis is being used when you are quoted.

12

Can a baby tooth need root canal treatment?

Yes: a pulpotomy or a full pulp treatment can be used on a child's tooth where decay or trauma has reached the nerve and the tooth needs to be kept as a space holder for the permanent tooth underneath. The approach differs from adult treatment because the anatomy and the goal, holding space instead of lifelong retention, are different.

Related glossary terms

Questions to take to a consultation

  1. Can this tooth be predictably restored afterward?
  2. Who will place the final restoration and when?
  3. What findings would change the prognosis?
  4. What symptoms require urgent follow-up?

Evidence record

Sources and scope

  1. What Is a Root Canal?American Association of EndodontistsAccessed 2026-08-17
  2. Tooth DecayNational Institute of Dental and Craniofacial ResearchAccessed 2026-08-17