Root canal treatment

Overview

A root canal treatment is a dental procedure to save a tooth that is badly infected or damaged. The dentist removes the infected pulp (the soft tissue inside the tooth), cleans and seals the space, then places a crown to protect the tooth.

Yes, root canal treatment is a very common dental procedure. Millions of people have it every year around the world.

Anyone with a tooth that has deep decay, a crack or chip, or has had repeated dental work on it can need a root canal. It affects people of all ages, but is less common in very young children whose teeth are still developing.

Symptoms

Common symptoms

• Severe tooth pain when chewing or biting
• Lingering sensitivity to hot or cold, even after the stimulus is removed
• A small, pimple-like bump on the gum near the sore tooth
• Darkening or discolouration of the tooth
• Swelling and tenderness in the nearby gums

Symptoms in children

• In children, symptoms can include pain when eating, sensitivity to sweets, or a swollen gum near a baby tooth. However, children may not always complain, so a dentist’s check-up is important.

Symptoms in older adults

• Older adults may have less noticeable pain because the nerve inside the tooth can die slowly. They might notice a change in the tooth’s colour or a bad taste in the mouth.

Causes

Main causes

• Deep tooth decay that reaches the pulp (the inner part of the tooth)
• A chip or crack in the tooth that lets bacteria into the pulp
• Repeated dental procedures on the same tooth that weaken it
• Injury to the tooth that damages the pulp, even if there is no visible crack

Risk factors

• Poor oral hygiene (not brushing and flossing regularly)
• A diet high in sugar and acidic foods
• Teeth grinding (bruxism), which can wear down teeth
• Not visiting the dentist for regular check‑ups

When to see a doctor

See a doctor urgently if:

• See a dentist as soon as possible if you have a toothache that keeps you awake or makes it hard to eat.
• If you notice swelling in your face or gums, or have a fever, seek emergency dental care immediately.

Book a routine appointment if:

• If you have a tooth that is sensitive to hot or cold, or you see a dark spot on a tooth, make a routine appointment for a check‑up.

Diagnosis

Your dentist will examine your tooth, check for pain and swelling, take X‑rays to see the root and surrounding bone, and sometimes do a cold or electric test to confirm the pulp is infected.

Tests that may be done

• Visual examination of the tooth and gums
• X‑rays (usually one or two images of the affected tooth)
• Sensitivity tests (cold, hot, or electric pulse) to check if the nerve is alive

What to expect at your appointment

The diagnosis is usually straightforward. If the pulp is infected, the dentist will explain the root canal procedure, answer your questions, and schedule the treatment. You may also be referred to a specialist called an endodontist if the tooth is very complex.

Treatment

The goal of root canal treatment is to remove the infected pulp, clean and disinfect the inner chamber, and seal it to prevent reinfection. Afterward, a crown is often placed to strengthen the tooth.

Self-care at home

• Take any pain relief as recommended by your dentist (avoid aspirin if bleeding is a concern).
• Eat soft foods on the side of your mouth that was not treated for the first few days.
• Brush and floss gently around the treated tooth, but avoid vigorous rinsing for 24 hours.
• Apply a cold pack to the outside of your cheek if there is swelling.

Medical treatments

The dentist will use a local anaesthetic to numb the area. They drill a small access hole, remove the infected pulp with fine instruments, clean the canals with antiseptic, and then fill them with a rubber‑like material called gutta‑percha. A temporary filling is placed, and later a permanent crown is fitted. Antibiotics may be prescribed if the infection has spread, but not routinely.

When is surgery considered?

In rare cases, if a standard root canal fails or the tooth has an unusual anatomy, a minor surgical procedure called an apicoectomy may be needed. This involves removing the tip of the root and sealing the end.

Living with this condition

After a root canal, you can return to normal activities the same day, though the tooth may feel sensitive for a few days. Once the crown is placed, you can chew normally. Keep up your regular oral hygiene and visit your dentist for check‑ups.

Lifestyle tips

• Brush twice a day with fluoride toothpaste.
• Floss daily to clean between teeth.
• Avoid chewing ice or hard candies that could crack the crown.
• Wear a mouthguard if you grind your teeth at night.

Diet and exercise

There are no dietary restrictions after the tooth heals. You can eat all normal foods. Exercise is fine, but avoid contact sports without a mouthguard to protect the tooth.

Mental health and emotional wellbeing

It is normal to feel anxious about dental procedures. If you are very worried, talk to your dentist about relaxation techniques or sedation options. Remember, the treatment relieves pain and saves your tooth. If you feel overwhelmed, reach out to a mental health professional or crisis support line.

Prevention

Good oral hygiene and regular dental visits can prevent most tooth decay and injury that lead to root canals. Wearing a mouthguard during sports and not using your teeth as tools also helps protect them.

Complications

If left untreated

• The infection can spread to the jawbone and cause a dental abscess.
• A severe infection may spread to the face, head, or bloodstream, which can be life‑threatening.
• The tooth may eventually fall out or need to be extracted.

Long-term outlook

The outlook after a root canal is very good. With proper care, a root‑canal‑treated tooth can last as long as your other natural teeth. The procedure has a high success rate and often saves a tooth that would otherwise be lost.

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