Sequelae is postoperative respiratory obstruction: Appropriate application of hormones during and after surgery can prevent laryngeal edema and reduce maxillofacial edema. Bleeding and Nerve Damage Injury to larger blood vessels during surgery, such as the internal maxillary artery, greater palatine artery, and inferior alveolar neurovascular bundle, can lead to severe bleeding. Necrosis of tooth and bone segments and poor bone healing. Necrosis of bone segments or poor healing of bone segments are mostly caused by excessive stripping of soft tissue. Postoperative occlusion disorder and recurrence of deformity. Occlusion disorder and recurrence of deformity after operation are mostly caused by unreliable fixation, insufficient preoperative orthodontics, and no stable occlusal relationship.