Grinding bones is risky. It is suggested that you must not choose a bone grinder through hearsay. Be sure to go to a regular professional hospital to find an experienced doctor for surgery. Bone grinding is an operation to change the face by removing a part of the cheekbones. This operation does not need to remove any bone, but only needs to use professional grinding tools to thin the outer layer of mandibular angle bone, thus reducing the width. The trauma of bone grinding operation is also very small and will not leave any scars. As long as the postoperative recovery is good, the recovery period is short and will not affect normal life. Bone grinding is a second-class operation, which must be audited by experts from the provincial health department. The general requirement of public hospitals is a third-class first-class hospital, and only powerful supporting medical facilities such as anesthesiology department and resuscitation room can be implemented.