Preoperative inflammation of the gums should be eliminated for oral hygiene guidance, so that patients can better control plaque, preoperative preparation in accordance with the principles of periodontal surgery. Surgical steps are as follows: 1, incision, probe the location and scope of the broken end of the tooth, estimate the location of the postoperative gingival margin incision, cut the teeth in the beautiful area, consider the position of the postoperative gingival margin in harmony with the neighboring teeth, and if the attached gingiva is insufficient, it should be carried out in the root direction to reset the flap; 2, flip the flap and scrape the treatment, flip the front and back flap to remove the residual gingival tissues, scrape off the granulation, and expose the broken surface of the tooth; 3, trim the alveolar bone, remove a part of the alveolar bone The broken end of the alveolar bone should be at least 3mm away from the top of the alveolar bone ridge to meet the biological width, and at the same time, it should be shifted to the top of the alveolar ridge of the neighboring teeth, and if it is in the anterior aesthetic area, the coordination of the anterior gingival morphology should be taken into consideration; 4. Thoroughly flattening of the root surface, removing the residual periodontal fibers on the root surface to prevent postoperative relapse; 5. Gingival flap trimming, repositioning, and suture, trimming the position and shape of the flap as well as the thickness and site, and suture it to the top of the alveolar ridge; 6. Suture; 6, placed periodontal plugging agent, compression hemostasis, gingival position and morphology after satisfactory placement of periodontal plugging agent; 7, postoperative routine care, maintain good oral hygiene.