Teeth are the tools for chewing food, and if there is a problem with them, it will affect the digestion of food and directly endanger the health of the body. The malformation of teeth, jawbone and face is medically known as malocclusion, which is what we call “malocclusion”. The harm of malocclusion is very right, can be summarized as the following five aspects: 1, affect the aesthetics. Since malocclusion is a malformation, the first will destroy a person’s appearance, serious malocclusion will also make some patients produce pessimism, and then appear psychological and mental disorders, may also have a negative impact on job hunting, mate selection. 2, affect the growth and development. For example, in the case of children with diastema, because of the opposite of normal growth, the lower teeth are on the outside of the upper teeth, the lower teeth will prevent the upper teeth from growing forward, resulting in insufficient development of the upper teeth, while the force of the upper joint to develop forward and push the lower jaw, making it overdeveloped. This forms a vicious circle, and the malformation will become more and more serious. 3.Harmful to health. Due to the misalignment of teeth, the bite is poor, so the chewing function is impaired, affecting digestion and absorption. Over time, it will cause malnutrition and affect the growth and development of the whole body of children. At the same time, due to the inconvenience of chewing food, the food enters the stomach and intestines without chewing fine enough, which leads to overload of gastrointestinal function and easily causes gastrointestinal diseases and indigestion. 4, hinder the pronunciation. As mentioned above, if there is backward and open, it will affect the pronunciation and cause slurred words when speaking. 5. Prone to dental disease. When the teeth are not aligned, the food residue will easily accumulate in the gap between the teeth, which is unfavorable to oral hygiene and conducive to the reproduction of bacteria, so it is easy to occur caries and periodontal disease, etc.