Requirements, must be deputy director and director level to operate the operation, as long as you choose the right hospital, the risk does not exist. At present, the long curve mandibular angle osteotomy is adopted. Compared with the previous mandibular angle surgery, the long curve mandibular angle surgery removes the edges and corners on both sides of the chin, and the postoperative effect is more natural and soft. There are nine hospitals in Shanghai and Huamei can be used as mandibular angle. These two hospitals are well-known plastic surgery hospitals in Shanghai.