Many patients requesting orthodontic treatment will say they have “buck teeth”, which is unattractive. In fact, the “buck teeth” is usually referred to as a malformation of tooth alignment or abnormal development of the “dental bed”, mainly manifested by the protrusion of the upper front teeth, excessive exposure of teeth and difficulty in closing the lips, which seriously affects the beauty of the face and can easily lead to some It also easily causes some diseases of the oral and jaw systems. Is “buck teeth” only related to teeth? The answer is no. According to clinical research, it is generally caused by abnormal tooth alignment or abnormal development of the upper and lower jaw bones (dental bed). Abnormal tooth alignment is usually caused by excessive anterior protrusion of the upper front teeth; abnormal development of the upper jaw bone is usually caused by the transitional development of the upper jaw bone or underdevelopment of the lower jaw bone. In this case, for example, excessive vertical development of the maxilla carrying the upper front teeth will result in excessive tooth exposure, and excessive anterior-posterior development will result in anterior malocclusion of the teeth and will cause anterior protrusion of the lips. In some serious cases, abnormal jaw development and tooth alignment can occur simultaneously, resulting in the presence of both “buck teeth” and “pick teeth”, which seriously affects facial aesthetics. “There are various mechanisms for the occurrence of “buck teeth”, so their treatment cannot be solved simply by inward retraction of the maxillary front teeth. This situation is hidden and generally requires a doctor with solid theory and experience to carefully analyze the x-rays and models in order to detect and treat the cause of the problem in order to achieve good results. Genetics is one of the more important reasons for the occurrence of “buck teeth”. The alignment of teeth, the development of bones, and the development of facial appearance generally receive genetic information from relatives. Bad habits in childhood may also lead to protruding teeth, such as sucking fingers, biting foreign objects, etc. Under the influence of long-term bad habits, the growth of teeth and bones will be affected to a certain extent, which may cause malformation of teeth or bones after puberty. Some diseases in childhood, such as allergic rhinitis, enlarged tonsils, and enlarged adenoids in the nasopharynx, can also cause “buck teeth”. As the causes of “buck teeth” are complex, it is very important to use different treatments for different reasons. Simple protrusion of teeth generally requires orthodontic treatment, but for those with skeletal developmental deformities, especially receding jaws, orthodontic treatment alone may not achieve the desired effect and requires some special treatment.