The operation is carried out through the oral cavity, mainly paying attention to thorough disinfection, reducing bacteria in the oral cavity as much as possible and reducing postoperative infection rate. When removing the masseter muscle, the medial side of the masseter muscle should be removed to avoid damaging the mandibular marginal branch of the facial nerve. The amount of masseter muscle resection depends on preoperative examination. Because most of the masseter muscle resection needs to remove the mandibular angle at the same time, the masseter muscle itself will shrink to a certain extent 3-6 months after operation, so the masseter muscle resection amount generally does not exceed one-third of the masseter muscle thickness. So don't worry about the rebound of plastic surgery.