Masticatory muscle hypertrophy is a kind of jaw angle hypertrophy, the jaw angle is obviously enlarged, turned out, and the face is national or trapezoidal. The jaw angle is prominent and asymmetrical on both sides. The ratio of the upper and lower width of the face is not coordinated, and the distance between the two jaw angles is too wide. Therefore, the occurrence of bite muscle hypertrophy is generally considered to be related to the chewing habits and dietary habits of people. Such as eating hard food or snacking, chewing gum habit. Some people also believe that the bite muscle hypertrophy is related to genetic factors, in fact, from the clinical point of view, there is indeed the phenomenon of familial bite muscle hypertrophy. The bite muscle hypertrophy is mostly accompanied by jaw angle hypertrophy, jaw angle exostosis and other situations. Prevention 1, the human chewing muscle, including the bite muscle temporal muscle, pterygoid muscle, pterygoid muscle, so the occurrence of bite muscle hypertrophy generally has to do with people chewing, habits and eating habits of people are very related, if the diet often eat some hard food, or snacking on chewing gum habits, these are related. 2, bite muscle hypertrophy is also related to genetic factors, in fact, from the clinical point of view, there are familial bite muscle hypertrophy phenomenon. The cause of bite muscle hypertrophy is mostly accompanied by jaw angle hypertrophy, jaw angle ectropion, etc., so in the clinical and bite muscle hypertrophy, called jaw angle muscle hypertrophy or bite muscle benign hypertrophy. 3, bite muscle hypertrophy should be distinguished from jaw protrusion deformity. Double jaw deformity, also known as double jaw protrusion. Bird’s mouth deformity, manifested as open lips and teeth, can not naturally shut up, the upper and lower front teeth protrude, can have bony or non-bony protrusion. Regardless of how protruding the teeth are, the jaw relationship is often still good.