Root canal retreatment for one root canal is an endodontic procedure performed when a previously treated tooth develops recurrent infection or symptoms. The process involves removing the existing filling material, thoroughly cleaning and disinfecting the canal, and sealing it again with new biocompatible materials.

This treatment allows preservation of the natural tooth by addressing residual bacteria, missed anatomy, or leakage from the previous filling. Root canal retreatment helps relieve pain, prevent further complications, and restore normal tooth function. The procedure is carefully planned to ensure effective disinfection, proper sealing, and long-term treatment success.