Oral diseases affect a wide range of areas and are harmful, especially the incidence of malocclusion is high, the harm to patients is greater, in general, there are the following aspects of the impact: 1, the impact on the oral cavity local: malocclusion teeth often have crowded misalignment, is not conducive to dental self-cleaning and brushing cleaning, easy to cause dental caries (tooth decay) and gingivitis, anterior protrusion of teeth easy to cause trauma, the author encountered clinical dental trauma, a large A large proportion of the clinical dental trauma I encountered were upper teeth protrusion. 2, the impact on the jaw and face: malocclusion affects the development of teeth and jaws. For example, the anticuspid (i.e., pocket tooth) due to the protrusion of the lower jaw, the upper jaw development is limited like a broad bean, commonly known as broad bean face, also known as pig waist face, the posterior teeth bite asymmetry easily cause facial asymmetry, finger sucking easily cause buck teeth, etc. 3, affect the oral function: for example, the anterior open bite causes abnormal pronunciation, the posterior open bite causes low chewing function, and serious jaw recession affects normal breathing. Some studies have shown that the chewing function of bony anterior malocclusion is 40% less than that of normal malocclusion. 4, the psychological and spiritual impact: malocclusion can cause psychological and spiritual impact on children and adults. Severe cases have a sense of inferiority, difficulties in interacting with others, and even depression. I have found a patient in the clinic, due to malocclusion caused depression, brought indelible pain to family members and themselves. 5, affect the aesthetic appearance. 6, affect digestion and gastrointestinal diseases: as the saying goes, good teeth appetite is good, eat well, it is true, good teeth chewing adequately, can reduce the burden on the digestive tract, enhance physical fitness.