With the appropriate care, your teeth that have had endodontic treatment will last as long as other natural teeth. However, sometimes reinfection occurs. According to the American Association of Endodontists:
With proper care, you’ll keep teeth that have had root canal treatment for a lifetime but it’s possible for those teeth to heal improperly, becoming painful or diseased months or even years after treatment. If this happens to your treated teeth you have a second chance to save the tooth with retreatment. An additional procedure may be able to diminish dental pain or discomfort and promote healing. If you suspect a tooth that had a prior root canal requires retreatment, contact us to set up a consultation appointment.