Malocclusion, also known as malocclusion, is a malformation of the teeth, jaws, and craniofacial surface of children caused by congenital genetic factors or acquired environmental factors, such as diseases, bad oral habits, and abnormal tooth replacement, during the growth and development process. Malocclusion does not only affect the facial shape, it has many dangers. What are the hazards of malocclusion? 1, affect the development of the jaw and face: because most malocclusion is formed during the growth and development of children, part of the malocclusion will affect the normal development of the upper and lower jaws, and the development of malocclusion more and more serious. 2.When the teeth are crowded and misaligned, it is not easy to clean and the occlusion abnormality can cause gum and periodontal inflammation and easy to suffer from dental caries. 3.Serious malocclusion can affect the chewing function and respiratory function, and also lead to abnormal swallowing, abnormal pronunciation and temporomandibular joint lesions. When the chewing function is obviously reduced, it can cause indigestion and gastrointestinal diseases. 4.It will affect the appearance to varying degrees. 5.Children suffer from low self-esteem due to the ridicule of classmates or small partners because of malocclusion, which affects psychological health; adult malocclusion can also affect social and professional choices, and even cause mental and psychological abnormalities.