Endodontic therapy in a mandibular second bicuspid with four canals.

Success in endodontic therapy often depends on the removal of the critical concentration of pulp tissue or necrotic debris within the root canal system. The best method to ensure this objective is to locate and instrument all of the canals in the root of the tooth. Therefore, a thorough knowledge of root canal morphology is essential to reduce the chances of failure. The purpose of this article is to report a case of mandibular second bicuspid with four distinct canals.