In the clinic, we often encounter anti-jaw, especially bony anti-jaw, the main reasons for the formation of: 1, genetic problems: such as paternal or maternal or even intergenerational genetic problems, such as overdevelopment of the mandible will have genetic problems, while if the child has bad habits at the beginning, such as missing back teeth, cuspid wear, etc. may produce jaw interference, so that the child forced the jaw forward, the early This may not be too serious, but if the child is in this state for a long time, it will slowly turn from a dental problem to a functional problem, or even a functional problem will slowly become a bony problem, which is more common in clinical practice, i.e., both functional and bony problems; 2. 3, cleft lip and palate: the rabbit’s mouth, cleft lip and palate will affect the development of the jaws, especially the maxilla, which leads to the formation of the antimandibular, which is also one of the important reasons for the formation of bony antimandibular.