Pre-operative precautions: 1. Patients without bleeding disorders and active or progressive diseases of the heart, lungs, liver and kidneys and other important organs, such as those suffering from hypertension, diabetes or infectious diseases, need to have surgery after their conditions are under control. 2.Patients who have been taking steroid hormones and aspirin for a long time should preferably stop using them one week before surgery, please consult the relevant doctor. 3.Surgery is not recommended for those who have the following nasal conditions: oral ulcers on the lips, the presence of skin infections such as boils and folliculitis on the chin. 4.Please avoid menstruation for female patients; hold off surgery during pre-pregnancy (3 months) and late pregnancy (3 months). 5.Since the slight local swelling after surgery may last for several weeks, the chin shape is slightly less natural at this time, so please consider avoiding important social occasions during this period when arranging the surgery. Chin surgery options: 1, chin shortening surgery: applicable to the chin is too long, the former protrusion, according to the situation need to grind bone or osteotomy. 2, chin lengthening surgery: applicable to the jaw recession, chin too short (“no chin”), can use silicone or expanded material to extend, or cut bone forward. 3, chin narrowing surgery: applicable to wide chin, according to the situation to take grinding or osteotomy surgery. Anesthesia: Local nerve block anesthesia: local injection of anesthetic at the surgical site, no additional charge. Intravenous general anesthesia: for long surgery time, many sites, or poor pain tolerance, intravenous administration of drugs, no tracheal intubation, additional charges (ranging from 1500-3000 RMB depending on the length of surgery). Pre-operative preparation: 1. Routine examination: (can be done on the day of surgery, no fasting for those under local anesthesia, fasting laboratory tests for those under intravenous general anesthesia; foreign patients can also be done in advance at local tertiary hospitals to save time, valid for 3 months). Local anesthesia surgery: routine blood, urine routine, coagulation four, cosmetic immune four (hepatitis B, hepatitis C, syphilis, AIDS); intravenous general anesthesia surgery: the above six items, liver and kidney function, fasting blood sugar, electrocardiogram. 2, those who choose local anesthesia normal diet, those who choose intravenous general anesthesia auxiliary 6 hours of preoperative fasting, 4 hours of water. 3. Pay attention to the cleanliness of the operation area before surgery and do not wear makeup. 4. Postoperative medication preparation: pain medication (the night after surgery), anti-swelling medication (within 1 week after surgery), mouthwash (within 1 week after surgery), anti-inflammatory medication. Post-operative precautions: 1. Eat cold liquid food on the day after surgery, gently rinse your mouth after eating to keep your mouth clean, you can brush your teeth, but pay attention to gently and do not touch the wound. 2, 1-2 days after surgery to avoid excessive exaggerated expression, 3 days avoid hot compresses, a week to prohibit touching the chin. 3, a week after surgery avoid tobacco, alcohol, fish and shrimp, spicy stimulation, harder food. 4, oral antibiotics for 3 days to prevent infection, if necessary, you can take painkillers (such as painkillers, tramadol, etc.). 5.The intra-oral sutures will be removed after 7 days. 6.Oedema, bruising, bruising in the postoperative area. Most of them will gradually subside after 1-2 weeks. If you find swelling and bruising or increased pain, bleeding, etc., please contact the doctor immediately. 7, chin osteotomy surgery, the operation may pull the chin nerve caused by transient injury, individual surgery may appear after the operation of the skin numbness, sensitivity and other discomfort, this symptom is temporary, generally a few months to six months after the gradual recovery. 8.Please contact the doctor for follow-up after six months.