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Why do I need root canal treatment?

Understanding what your dentist has found and why treatment may have been recommended

Being told that you need root canal treatment can be confusing – particularly if your tooth doesn’t hurt very much.

What exactly is wrong with it? Why can’t you just have a filling? And what happens if you leave it alone?

Root canal treatment is generally considered when the soft tissue inside a tooth, known as the dental pulp, has become inflamed, infected or damaged and simply repairing the outside of the tooth will not address the problem.

The aim of treatment is to deal with the problem inside the tooth and, where appropriate, allow the natural tooth to remain in your mouth.

What is happening inside my tooth?

Although the part of a tooth you can see looks solid, there is a space inside it containing dental pulp.

The pulp contains nerves and blood vessels and plays an important role while your tooth develops.

The pulp can become inflamed, infected or damaged.

Possible causes include:

  • deep tooth decay
  • a crack or fracture
  • trauma to the tooth
  • previous extensive dental treatment
  • other damage affecting the pulp

Once the pulp has been significantly affected, treating the outside of the tooth alone may not resolve the problem.

This is why your dentist might recommend root canal treatment.

What does root canal treatment actually do?

Root canal treatment is also known as endodontic treatment.

During treatment, the clinician accesses the inside of the tooth, removes inflamed or infected pulp tissue and carefully cleans, shapes and fills the root canal system.

The NHS describes root canal treatment as treatment used to remove infection from inside a tooth before the root canal is cleaned and filled.

Importantly, the tooth itself isn’t removed.

Where the tooth is suitable for treatment, the aim is to treat the problem within it so that your natural tooth can remain.

What are the signs that I might need root canal treatment?

There isn’t a single symptom that means you definitely need a root canal.

Possible symptoms can include:

  • persistent toothache
  • significant sensitivity to hot or cold
  • pain or tenderness when biting
  • swelling
  • tenderness around a tooth
  • a small swelling on the gum
  • a tooth becoming darker following trauma

But these symptoms can have other causes.

That’s why an examination is important.

What if my tooth doesn’t hurt?

This surprises many people.

A tooth does not necessarily have to be painful for root canal treatment to be recommended.

Sometimes symptoms change as the condition of the pulp changes. In other cases, a problem is identified during a dental examination or on an X-ray.

So:

“It doesn’t hurt” doesn’t necessarily mean “there’s nothing wrong”.

Equally:

“It hurts” doesn’t necessarily mean “I need a root canal”.

The diagnosis matters more than one symptom.

How does my dentist decide whether I need root canal treatment?

Your dentist will build a picture from several pieces of information rather than relying on one test.

This may include:

Your symptoms

What have you noticed?

When did it begin?

What makes it better or worse?

Your dental history

Has the tooth previously had a large filling, crown, trauma or other treatment?

Examination

Your dentist will look carefully at the tooth and surrounding tissues.

Tests

Different tests can help your dentist understand how the tooth is responding.

Dental X-rays

X-rays can provide useful information about the tooth, roots and surrounding area.

Further imaging where appropriate

In selected cases, three-dimensional CBCT imaging may provide additional useful information.

A CBCT scan isn’t automatically necessary simply because you may need root canal treatment.

Why can’t I just have a filling?

This depends on how far the problem has progressed.

If decay or damage affects the outside of a tooth but the pulp remains sufficiently healthy, repairing the tooth with a filling or another restoration may be appropriate.

But once the pulp itself has become significantly inflamed, infected or damaged, simply placing a filling over the tooth does not treat what is happening inside it.

Your dentist should be able to explain why a filling is or isn’t an appropriate option for your particular tooth.

What happens if I don’t have root canal treatment?

This depends on the diagnosis.

If the pulp is infected and the source of the problem isn’t treated, it won’t necessarily resolve by itself.

The NHS advises that if an infected tooth is not treated, it may eventually need to be removed.

But that doesn’t mean every patient who is advised to have a root canal must immediately agree to treatment.

You should understand:

  • what your dentist believes is happening
  • what treatment is being recommended
  • what alternatives exist
  • what the consequences of delaying or declining treatment might be

That allows you to make an informed decision.

Does needing root canal treatment mean my tooth can definitely be saved?

No.

This is an important distinction.

Root canal treatment is often considered because retaining the natural tooth may be possible.

But the root canals are only one part of the picture.

Your clinician also needs to consider things such as:

  • how much healthy tooth structure remains
  • whether the tooth can be restored
  • whether there is a crack or fracture
  • the condition of the supporting tissues
  • previous treatment
  • the complexity of the tooth

There are circumstances where root canal treatment may not be considered appropriate and extraction may instead be discussed.

Related: Root canal treatment or extraction – how do I decide?

Do I need to see an endodontist?

Not necessarily.

Dentists provide root canal treatment as part of general dental care.

Sometimes a dentist may recommend specialist assessment or treatment because a case is particularly complex, a tooth has been previously treated or another aspect of the case would benefit from specialist endodontic assessment.

At Evolve, specialist endodontic care is provided by:

Dr Alex Brett – Specialist Endodontist, GDC no. 244328.

Alex accepts referrals from dentists as well as patients who choose to self-refer.

Related: What is an endodontist and why might I need to see one?

Myth versus reality

Myth: If my tooth doesn’t hurt, I don’t need root canal treatment

Reality: Some problems are identified even when symptoms are mild or absent. Diagnosis is based on your examination and relevant investigations, not pain alone.

Myth: Root canal treatment means removing the tooth

Reality: Root canal treatment treats the inside of the tooth. Where appropriate, its purpose is to allow the natural tooth to remain.

Myth: Everyone needing a root canal should see a specialist

Reality: Many root canal treatments can be provided by general dentists. Specialist assessment may be recommended or chosen in particular circumstances.

Questions patients often ask

Can antibiotics cure a tooth that needs root canal treatment?

Antibiotics are not a substitute for treating the underlying problem within the tooth.

Whether antibiotics are appropriate depends on your clinical circumstances. Your dentist will decide whether they are indicated.

Can I wait and see if it settles?

That depends on the diagnosis.

Symptoms can sometimes change without the underlying problem being resolved. Ask your dentist what they believe will happen if treatment is delayed.

Can I have the tooth removed instead?

Extraction may be one of the alternatives in some cases.

However, removing a tooth has its own implications, including whether the resulting space needs to be replaced.

Read: Root canal treatment or extraction – how do I decide?

Key takeaways

  • Root canal treatment treats a problem affecting the inside of a tooth.
  • Pain isn’t the only reason treatment may be recommended.
  • Toothache doesn’t automatically mean you need root canal treatment.
  • Diagnosis should be based on an appropriate assessment.
  • Root canal treatment isn’t suitable for every tooth.
  • You should understand your diagnosis, options and alternatives before deciding.

Want to understand the whole process?

Our complete patient resource explains root canal treatment, what happens during treatment, when specialist care might be appropriate and what to expect afterwards.

Your guide to root canal treatment

What it means, what to expect and understanding your options

Root Canal Guide

Would you like a specialist assessment?

If you’ve been told you need root canal treatment and would like specialist advice, you can see Dr Alex Brett, Specialist Endodontist, at Evolve.

Your dentist can refer you, or you can contact us directly.

Speak to our team about an endodontic assessment

For independent information, read the  ⁠NHS guide to root canal treatment.

You can also ⁠read Evolve Dentistry’s CQC report.

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🍰 Cakes until 5pm
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