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Why it’s needed
The infection at the centre of a tooth (the root canal) is caused by bacteria that live in the mouth and invade the tooth.
This can happen after:
- tooth decay
- leaky fillings
- damage to teeth as a result of trauma, such as a fall
Tooth structure
A tooth is made up of 2 parts. The crown is the top part of the tooth that’s visible in the mouth.
The root extends into the bone of the jaw, anchoring the tooth in position.
Teeth also consist of:
- enamel – the hard outer coating
- dentine – a softer material that supports the enamel and forms most of the tooth
- cementum – a hard material that coats the root’s surface
- dental pulp – the soft tissue at the centre of the tooth
The root canal system contains the dental pulp and extends from the crown of the tooth to the end of the root.
A single tooth can have more than 1 root canal.
When root canal treatment is needed
Root canal treatment is only required when dental X-rays show that the pulp has been damaged by a bacterial infection.
The pulp will begin to die if it’s infected by bacteria, allowing the bacteria to then multiply and spread.
The symptoms of a pulp infection include:
- pain when eating or drinking hot or cold food and drink
- pain when biting or chewing
- a loose tooth
As the infection progresses, these symptoms often disappear as the pulp dies.
Your tooth then appears to have healed, but the infection has in fact spread through the root canal system.
You eventually get further symptoms such as:
- pain when biting or chewing returning
- swelling of the gum near the affected tooth
- pus oozing from the affected tooth
- facial swelling
- the tooth becoming a darker colour
It’s important to see your dentist if you develop toothache. If your tooth is infected, the pulp cannot heal by itself.
Leaving the infected toohttps://www.nhs.uk/conditions/toothache/th in your mouth may make it worse.