If you don't have big bones, I suggest you don't choose bone grinding surgery. Grinding bone is obviously lenient to mandible, even for people who remove muscle fat. You can consider grinding bones, which is risky and slow to recover. The main risks are: infection, bleeding, mandibular fracture, asymmetry, difficulty in opening mouth, superficial skin relaxation, mandibular nerve injury and so on. There are strict indications. Only people who meet the following conditions can do bone grinding. 1, healthy, no serious illness. 2, the face is wide, excluding fat and muscle. 3. According to the X-ray film, it is determined that the remaining bone after grinding will not cause mandibular fracture. 4. Have enough recovery time. If you have fat, drooping skin, deep nasolabial groove, thick cheeks and well-developed masticatory muscles, I suggest you choose the ultrasonic face-lifting method, which has a tightening effect on loose skin, no injections, no scars, quick recovery and no side effects on your body. As long as you don't overeat, it can last for 5 to 10 years and it is not easy to rebound.