First, the surgical treatment of the “protruding teeth” “protruding teeth” is essentially a maxillary protrusion deformity or double jaw protrusion deformity, which affects the aesthetics. Patients often show open lips and teeth, the natural state of the lips can not be closed, smile when the gums exposed too much, often accompanied by chin retraction, forced to close the mouth, there is a significant soft tissue bulge between the lower lip and the chin. The upper and lower front teeth in the mouth are lip-tilted and crowded. This deformity generally requires a period of orthodontic preparation to align the teeth, and then use the maxillary recession surgery (or both upper and lower jaw surgery, or the addition of chinplasty) for orthodontic treatment. The surgical treatment of “Geodesic” is often referred to as “Geodesic”, the medical name is mandibular protrusion or mandibular overdevelopment. The normal bite relationship should be the upper teeth covering the lower teeth, the upper lip is slightly more protruding than the lower lip. In the case of “encephalitis”, the bite is the opposite, with the lower teeth biting back on the outer side of the upper teeth, or the upper and lower teeth facing each other cusp to cusp. The chin protrudes forward in a concave shape, and there is poor chewing and pronunciation. This type of deformity is caused by the overdevelopment of the lower jaw, which cannot be solved by orthodontic treatment alone and must be corrected by surgery to restore normal facial appearance and occlusal function. The specific treatment plan will be determined after consultation between the orthodontist and the maxillofacial surgeon (usually using the mandibular sagittal split or adding the maxillary Lefort osteotomy). Surgical treatment of facial deviation Facial deviation refers to the asymmetry of the patient’s face, with the midline of the lower jaw deviating to one side. This type of patient not only has an unorthodox facial appearance, but also has a misaligned bite, low masticatory function and joint problems. There are many causes of “crooked face”, which can be broadly divided into two categories: one is due to the existence of bad habits, such as chewing on one side, long-term one-handed chin rest, etc., and unexplained overdevelopment of the condyle on one side to inhibit the development of the mandible on one side, or overdevelopment on one side, resulting in asymmetric development of the mandible on both sides and facial deviation. Another type of facial deviation is caused by tumor or joint ankylosis of the condyle on one side. The treatment methods for these two types of patients are also different: the first type of patients usually need a combination of preoperative orthodontics – orthognathic surgery – postoperative orthodontics to obtain both functional and cosmetic results. Pre-operative orthodontics usually takes about one year, and surgery requires a two-week hospital stay to restore the patient’s facial shape and bite function, while post-operative orthodontics is used to fine-tune the bite and prevent post-operative relapse. In the second category, after the primary disease is removed, the patient’s facial soft and hard tissues should be restored for each patient’s different situation, in order to obtain a basic symmetry of the face under static conditions.