The treatment for tooth decay largely depends on how advanced the problem is.
If your decay is in the early stages, your dentist may apply a fluoride varnish to the area to help stop further decay. If decay has worn away your enamel (the hard outer coating of a tooth) and led to a cavity, your dentist will remove the soft decay and replace the hole in your tooth with a filling. If the nerve in the middle of your tooth is damaged, you may need root canal treatment, which removes the nerve and restores the tooth with a filling or crown.
If the tooth is so badly damaged it cannot be restored, it may need to be removed.

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