It's best to find a professor from the University of Southern California. This piece of Professor Wang is no problem. The use of nitrogen powered osteotome has the advantages of less trauma, short operation time and quick recovery. Stay in hospital for 3 days, and you can be discharged without inserting a drainage tube. Intravenous anesthesia was used and the postoperative experience was good. Mandibular angle resection is to completely separate the skin tissue from the bone at the operation site, so that it will not harm the skin tissue and nerve blood vessels during the operation. However, the operation requires general anesthesia to make the patient feel better. After the operation, our recovery work will be faster, and the impact on our normal life will be less.