Endodontic treatment, also known as endodontic treatment, is a procedure used in dentistry to treat pulpal necrosis and root infections. The procedure preserves the tooth and thus complements tooth extraction. The procedure is tedious and usually takes two to four visits to complete. Treatment steps: The first step, the root canal preparation stage, is preceded by the preoperative evaluation, pulp preparation and working measurements for root canal therapy, followed by the stage of root canal preparation, which can be done in two ways, depending on the instruments chosen. The second step is the root canal disinfection stage. In root canal therapy, experts recommend that the root canal can be sealed once for teeth with live pulp or bad teeth with infection limited to the crown pulp, and once for others; The third step, root canal filling stage, in the root canal treatment procedure for root canal filling, to grasp the timing of filling, generally is no conscious symptoms, no obvious percussion pain, no foreign body in the root canal, no exudation, no acute periapical inflammatory symptoms can be filled, do not have to wait until all symptoms disappear, and do not necessarily wait for the fistula to completely heal, repeated sealing drugs easily cause greater stimulation of the periapical.