Orthognathic surgery is typically performed by oral and maxillofacial surgeon or a craniofacial surgeon, with an orthodontist assisting.  The purpose of Orthognathic surgery is to ensure that the necessary structure exists in the mouth so that the orthodontic treatment will be successful. Orthognathic surgery usually involves the jaw bones, where modifications are done by cutting the bones of the mandible or maxilla and putting them back together properly aligned. The surgery is performed under general anesthetic and the teeth are wired together after surgery so the jaw can heal correctly. Usually, the incisions are made inside the mouth and not in the skin.