Stages of Endodontic Treatment

Endodontic treatment, more commonly called root canal treatment, is used when the soft tissue inside a tooth—the dental pulp—has become irreversibly inflamed or infected. The aim is to remove the affected tissue, disinfect the root canal system, seal the tooth and preserve as much of the natural tooth as possible.

The exact procedure varies according to the tooth, its root anatomy and the extent of infection, but most root canal treatments follow the same key stages.

1. Examination and Diagnosis

The first stage is confirming whether root canal treatment is actually necessary. Your dentist or endodontist will ask about your symptoms, examine the tooth and usually take dental X-rays.

Assessment may include:

• Testing the tooth’s response to cold or other vitality tests
• Tapping or pressing around the tooth to identify tenderness
• Checking for swelling, cracks or deep decay
• Assessing the surrounding gum and bone
• Taking X-rays to examine the roots and look for infection around them

Three-dimensional imaging such as CBCT may sometimes be used for more complex cases, but it is not necessary for every root canal.

If you have persistent tooth pain and are unsure of the cause, a dental examination is the first step.

2. Local Anaesthetic and Rubber Dam Isolation

Root canal treatment is normally carried out using local anaesthetic so that the tooth and surrounding area are numb during the procedure.

The tooth is then isolated using a rubber dam, a small sheet placed around the tooth. This keeps saliva and bacteria away from the treatment area and helps prevent instruments or irrigating solutions from entering the mouth.

Rubber dam isolation is an important part of modern root canal treatment because it helps maintain a clean treatment field and protects the patient during the procedure.

If dental treatment makes you particularly anxious, Glow Dental also provides support for nervous dental patients, and sedation may be available in appropriate cases.

3. Accessing the Root Canals

Once the tooth is numb and isolated, the dentist creates a small opening through the tooth to reach the pulp chamber and root canals.

Teeth can have very different canal systems. Front teeth often have relatively simple anatomy, while molars may contain several roots and canals. Magnification and specialist lighting can help locate small or unusual canal openings.

4. Cleaning, Shaping and Disinfecting the Canals

The inflamed or infected pulp is removed using very fine endodontic instruments. The canals are then carefully shaped so they can be thoroughly disinfected and later sealed.

During this stage, the dentist repeatedly flushes the canal system with antimicrobial irrigating solutions. Sodium hypochlorite is commonly used because it can help disinfect the canals and dissolve organic tissue that mechanical instruments cannot remove completely.

The aim is not simply to make the canals wider—it is to reduce bacteria and remove infected or damaged tissue while preserving as much sound tooth structure as possible.

5. Temporary Medication or Completing Treatment

Some root canal treatments can be completed in a single treatment visit, while others require more than one appointment.

If treatment is being carried out over several visits, medication may be placed inside the canals and the tooth sealed with a temporary filling between appointments.

The number of visits depends on factors such as the complexity of the canal system, the presence of infection, previous root canal treatment and how the tooth responds.

6. Filling and Sealing the Root Canals

Once the root canal system has been adequately cleaned, disinfected and prepared, the canals are dried and filled.

The most commonly used filling material is gutta-percha, a biocompatible rubber-like material. It is used together with an endodontic sealer to fill the prepared canal space and help prevent bacteria from re-entering it.

X-rays may be taken during or after treatment to check the position and extent of the root filling.

7. Restoring and Protecting the Tooth

Root canal treatment is not complete simply because the canals have been filled. The tooth also needs an effective restoration above the root canal system to protect it from leakage and fracture.

Depending on how much tooth structure remains, the final restoration may be:

• A dental filling
• A core build-up
• An inlay or onlay
• A dental crown

Posterior teeth such as molars and premolars often need additional protection because they are exposed to substantial chewing forces and may already have lost significant tooth structure through decay, previous fillings or the access required for treatment.

It is more accurate to say that root-treated teeth can be at greater risk of fracture because they have often lost substantial tooth structure—not simply because removing the pulp automatically makes the tooth brittle.

8. Healing and Follow-Up

The tissues around the end of the root may take time to heal after treatment, particularly if there was infection around the tooth beforehand.

Your dentist may recommend follow-up examinations and X-rays to monitor healing. Mild tenderness or soreness for a few days after treatment can occur and normally improves gradually.

Maintaining good brushing, interdental cleaning and regular dental check-ups is important for protecting the tooth from new decay and helping the final restoration last.

How Many Appointments Does Root Canal Treatment Take?

There is no fixed number. Some straightforward cases may be completed in one visit, while more complicated teeth may require two or more appointments.

Complex canal anatomy, significant infection, previous root canal treatment or difficulty accessing the canals can all increase treatment time.

A root canal appointment can also be relatively lengthy because cleaning and disinfecting the canal system thoroughly requires precision rather than speed.

Is Root Canal Treatment Painful?

Modern root canal treatment is performed under local anaesthetic and should normally be comfortable while the treatment is being carried out.

The tooth and surrounding tissues can feel tender afterwards, particularly if there was significant inflammation or infection before treatment. This usually improves over the following days.

In many cases, the pain caused by the inflamed or infected pulp is considerably worse than the treatment used to resolve it.

What Happens If You Do Not Have Root Canal Treatment?

If the pulp is irreversibly infected, it cannot normally recover simply by waiting or by taking antibiotics alone.

Untreated infection may lead to:

• Continued or worsening toothache
• A dental abscess
• Swelling
• Loss of bone around the root
• Eventually needing the tooth extracted

Antibiotics may sometimes be required when infection has spread and there are signs such as significant swelling or systemic illness, but they do not remove the source of infection from inside the root canal system.

If you develop significant swelling, severe pain or another urgent dental problem, contact an emergency dentist promptly.

How Successful Is Root Canal Treatment?

Root canal treatment is generally successful at controlling infection and retaining natural teeth, but no dental treatment can be guaranteed to last forever.

Long-term success depends on several factors, including:

• The original condition of the tooth
• The complexity of its root canal anatomy
• How effectively the canals can be disinfected and sealed
• How much healthy tooth structure remains
• The quality and timing of the final restoration
• Future decay or fracture
• Ongoing oral hygiene

With effective treatment, an appropriate final restoration and good ongoing dental care, many root-treated teeth continue to function successfully for many years.

Can a Root Canal Fail?

Occasionally a tooth does not heal as expected or develops a new infection months or years later.

Possible reasons include previously undetected canals, complex anatomy, persistent bacteria, new tooth decay, leakage around a filling or crown, or a fracture in the tooth.

Depending on the cause, it may still be possible to save the tooth with root canal retreatment or endodontic surgery such as an apicectomy.

Do You Always Need a Crown After Root Canal Treatment?

No. Not every root-treated tooth automatically needs a crown.

The decision depends mainly on the location of the tooth, how much healthy structure remains and the forces it needs to withstand.

A front tooth with relatively little structural loss may sometimes be restored with a filling, while a heavily restored molar or premolar may benefit from a crown, onlay or another restoration that protects the remaining cusps.

Your dentist will assess how best to protect the tooth after treatment rather than applying the same restoration to every root-treated tooth.

What Can You Eat After Root Canal Treatment?

While the local anaesthetic is still working, it is sensible to avoid chewing so that you do not accidentally bite your lip, cheek or tongue.

If the tooth has a temporary restoration, avoid placing excessive pressure on it until the permanent restoration has been completed. Your dentist will give instructions based on the individual tooth and stage of treatment.

Can You Brush Your Teeth After a Root Canal?

Yes. You should normally continue brushing and cleaning your teeth as usual, although the treated area may feel slightly tender at first.

Good oral hygiene remains important because root canal treatment does not prevent the outside of the tooth from developing new decay or gum problems.

If plaque or gum health is a concern, regular appointments with a dental hygienist can form part of maintaining the treated tooth and the rest of your mouth.

Can a Root-Treated Tooth Become Infected Again?

Yes, although this does not happen in every case. Reinfection can occur if bacteria remain within complex areas of the canal system or gain access to the tooth later through new decay, a leaking restoration or a fracture.

This is why both the quality of the root canal treatment and the restoration placed afterwards are important for long-term success.

What Is Root Canal Retreatment?

Root canal retreatment involves reopening a previously treated tooth, removing the existing root filling material, cleaning and disinfecting the canals again and then resealing them.

Retreatment may be considered when a tooth has not healed as expected or develops new signs of infection.

Because retreatment can be more technically complex than first-time treatment, referral to an endodontist may be appropriate.

Root Canal Treatment or Tooth Extraction?

When a tooth can be predictably restored, root canal treatment allows the natural tooth to remain in place rather than removing it.

Extraction may be necessary when the tooth cannot be restored, has a severe fracture, has insufficient periodontal support or has another problem that makes long-term preservation unrealistic.

If a tooth does have to be removed, replacement options may include a dental implant, bridge or denture depending on the individual circumstances.

Whenever possible, the advantages, limitations and long-term implications of preserving the tooth and extracting it should be discussed before making a decision.

Root Canal Treatment at Glow Dental

Glow Dental provides specialist root canal treatment in Battersea with the aim of treating infection and preserving the natural tooth whenever this is clinically possible.

If you have toothache, swelling or have been told that you may need root canal treatment, the first step is an appropriate assessment. New patients can learn more about becoming a patient at Glow Dental or view our current dental fees.

Frequently Asked Questions About Endodontic Treatment

What is the difference between endodontic treatment and a root canal?

They generally refer to the same treatment. Technically, the root canal is the space inside the root of the tooth, while endodontic or root canal treatment is the procedure used to clean, disinfect and seal that space.

Does a root canal remove the nerve?

The dental pulp contains nerves, blood vessels and connective tissue. During root canal treatment, inflamed or infected pulp tissue is removed from the tooth and the canal system is cleaned and sealed.

How long does a root canal take?

Treatment may be completed in one appointment or spread across two or more visits. The time required depends on the tooth, the number and complexity of its canals, infection and whether the tooth has previously been treated.

How long does a root canal tooth last?

There is no guaranteed lifespan. Many root-treated teeth function successfully for decades when treatment is effective, the tooth is restored appropriately and good oral hygiene is maintained.

Can you get a root canal twice on the same tooth?

Yes. If a previously root-treated tooth becomes infected again or does not heal as expected, root canal retreatment may sometimes allow the tooth to be preserved.

Summary: What Are the Stages of Endodontic Treatment?

The main stages of endodontic treatment are diagnosis, local anaesthesia and isolation, accessing the root canals, cleaning and disinfection, filling and sealing the canal system, and finally restoring and protecting the tooth.

The goal is not simply to “remove the nerve”. Successful root canal treatment aims to control infection, create a well-sealed root canal system and restore the tooth so it can continue functioning for as long as possible.

If you are experiencing persistent toothache or have been advised that you may need root canal treatment, find out more about root canal treatment at Glow Dental or arrange a new-patient examination.