Teeth that have been endodontically treated will last as long as other natural teeth with the appropriate care. Occasionally pain and symptoms of infection persist after receiving treatment or the infection fails to heal. Other times, pain and new infection may develop at months or years later. Endodontic retreatment may be indicated to resolve the infection.

Common reasons endodontic treatment is necessary include:

• Complicated root anatomy
• New decay causing new infection
• Cracked or loose filling or crown
• Radiographic signs of non-resolving/new infection