Do root canals always work? No! A root canal is a therapy not a cure. Though the chances of failure are small – 4% failure rate- they do exist especially if a tooth is left unprotected after root canal therapy is completed. If your root canal therapy, complete with a protective restoration, fails within 3 years we will evaluate whether re-treatment is necessary and by whom. If we retreat the tooth, we will do so at no charge or provide credit of the original fee to an endodontist who performs the re-treatment procedure. In addition, if the tooth cannot be saved, the cost of the crown and buildup placed in our office will be credited toward replacing that tooth during the 3 year period. There are rare instances we will inform the patient that we cannot provide a warranty on tooth with a poor prognosis.