1. negotiation: the surgeon expresses to the doctor what he wants to reduce and what he wants to achieve. Doctors usually take X-rays or even magnetic resonance before operation to clearly understand the bone structure, and then make suggestions according to personal characteristics to determine the operation method.

2, anesthesia: divided into local anesthesia and general anesthesia.

3. pry the inside of the mouth near the mandibular angle or cheekbones, pull the whole facial skin and muscles away from the mouth, separate the muscles from the periosteum, expose the bone parts that need surgery, and then perform bone grinding surgery. Because most of the blood vessels and nerves are in the position where the muscles are connected with the skin, the incision is in the oral cavity, and the instruments are protected and the nerves are separated from the muscles during the operation, which is very safe.

4. Hemostasis: Because of its small trauma and less bleeding, applying bone wax to the incision of the bone can not only stop bleeding, but also help the bone to recover itself.