Orthodontics for bony antimandibles depends on whether the patient is specifically underdeveloped in the upper jaw or overgrown in the lower jaw. At this point, a series of examinations are performed by the orthodontist, including a model examination and, clinically, lateral cephalometric measurements, and then an orthognathic procedure is determined between the orthodontist and the orthognath. Sometimes the upper jaw is underdeveloped and may need to be moved forward, and if the lower jaw is overdeveloped, the lower jaw may need to be receded. The mandibular recession may also take the form of a sagittal recession of the mandible, or a vertical recession of the mandible in extension, with the recession fixed after incision. Maxillary advancement medically means that the maxillary osteotomy alveolar bone area is moved forward, fixed and then the jaws and teeth are moved to establish a good occlusal relationship, which will have a great improvement on the patient’s facial shape or soft tissue. If the patient has both maxillary or mandibular problems, it may be necessary to perform orthopedic surgery on both the upper and lower jaws at the same time, which is usually called bimaxillary orthodontics in the sense that it may achieve better results for the patient. During the orthodontic procedure, there may be a preoperative orthodontic tooth alignment, and after the preoperative tooth alignment is completed, the orthognathic surgery is then performed. After orthognathic surgery is completed, there is post-operative orthodontics, which is subtle tooth adjustment, or mild intermaxillary relationship adjustment, and pre-operative and post-operative adjustments can achieve better results.