Mandibular grinding and plastic surgery makes the face smaller, the mandibular angle becomes an awl face, and the face with a big face is smaller. Many people begin to grind their bones and thin their faces, and a delicate face will appear after bone grinding and plastic surgery, while some people are afraid that their faces will droop after surgery. Experts from Beijing Wangfujing Plastic Surgery Hospital said: In fact, the face will not droop after the mandible is smoothed. But before the operation, you need to make sure that you are healthy and have no organic lesions in important organs. During the operation, women should avoid menstrual period, and routine blood and urine tests, chest X-ray, electrocardiogram and other routine health checks should be done before operation. Special patients should also do "sawtooth section of mandible" and lateral X-ray examination of mandible. Generally speaking, the effect of mandibular grinding is very good, and the effect will be more ideal after recovery. In order to prevent postoperative infection, people should fast for two days after mandibular grinding, mainly relying on infusion to maintain their physiological needs, and begin to eat liquid food, such as milk, juice and broth, 48 hours later. After 72 hours, you can eat semi-liquid food, such as yogurt, egg soup, rotten noodle soup, porridge and so on. And then gradually transition to a normal diet, but you can't eat hard food or laugh for a month.