What is a root canal treatment?

A root canal treatment involves drilling a hole into a decayed tooth and removing the soft centre, known as the dental pulp. The dental pulp is made up of connective tissue, nerves and blood supply, and extends into the roots of the tooth. The crown, or surface of the tooth that is used for chewing, may also be replaced if necessary.

Root canal therapy can be performed by your regular dentist or a specialist endodontist.

When is a root canal treatment needed?

A root canal treatment can save a badly infected or damaged tooth. The tooth may have become infected or damaged by decay, repeated dental work, cracked fillings or an injury to the tooth.

When the dental pulp is damaged, bacteria can start to multiply inside the tooth. This can lead to an infection or abscess, which is a pocket of pus that forms at the end of the tooth’s root.

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

Sometimes there are no symptoms that a tooth needs root canal therapy. More commonly, the signs include:

• severe toothache when chewing
• sensitivity to hot or cold that lasts after the heat or cold has been removed
• darkening of the tooth
• swollen and tender gums
• a persistent pimple on the gums or a hole in the tooth
• swelling of the face or neck.

What happens during a root canal treatment?

First, the dentist takes an X-ray of the tooth to see the shape of the root canals and determine whether there is any infection in the bone around the tooth. They will use a local anaesthetic to numb the area around the tooth before drilling a hole in the tooth to remove the pulp.

It can take several appointments for the dentist to clean and shape the hole inside the tooth before placing a sterile filling inside. They may also insert a small support into the root canals to strengthen the tooth. They may cap the tooth with an artificial crown if necessary.

Root canal therapy can be more uncomfortable than a normal filling, because it takes longer, but it is often no more painful.