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Most teeth that have had root canal therapy can last as long as other natural teeth. In some cases, a tooth that has had endodontic treatment fails to heal. Occasionally, the tooth can become painful or diseased months or even years after successful root canal therapy. If your tooth has not healed or has developed new problems, you have a second chance at saving your tooth. Another procedure, endodontic retreatment [root canal retreatment] may be performed by your endodontist. As with any dental or medical procedures, occasionally, a tooth may fail to heal following the initial treatment for several reasons:
The final restoration was delayed following endodontic treatment.
During initial treatment, narrow or curved canals were not properly cleansed.
Sometimes a new problem can develop in a tooth that was successfully treated during the initial procedure. These include:
A fracture occurs. New decay develops, exposing the canal to bacteria and a new infection. Infection can occur if the crown or filling becomes loose or cracked.