If you have a tooth that has had endodontic (root canal) treatment, it can last as long as your natural teeth. In some cases, however, the tooth can become re-infected. This can happen months or years after your original treatment. In some cases, the root canal can be redone with endodontic retreatment.
Reasons why healing has not successfully occurred:
- Narrow or curved canals that were not easily accessed and were not treated at initial treatment.
- New decay (cavity) in the tooth.
- Broken or cracked crown.
- The permanent restoration (e.g., crown, filling) was not placed within the appropriate time following the procedure.
- The permanent restoration did not create an adequate seal, allowing saliva and bacteria to re-infect the tooth.