Under normal circumstances, when the upper and lower teeth bite together, it should be the upper front teeth bite on the outside of the lower front teeth, if the opposite (i.e., the lower front teeth bite on the outside of the upper front teeth), the medical term is called “anterior anticleralism”, “anticleralism”, commonly known as This is commonly known as a “periosteum”, also known as a “pocket tooth”. Since “pericoronitis” has a tendency to worsen with growth if left untreated, it is best to have it corrected as early as possible. For those patients whose parents or relatives have “teres”, there is a possibility of recurrence with growth and development after treatment, so many cases have to be treated in stages, and the treatment takes a longer period of time. The treatment of “periosteum” during the period of milk teeth: the best correction time is 3~5 years old, if the correction time is too early, it is difficult for the children to cooperate with the treatment; and too late (6~7 years old), the milk and permanent teeth begin to replace the root of the milk teeth has been resorbed, then it will bring difficulties to the treatment. At this time, the application of simple activity braces or functional braces can receive good results. It is generally believed that more than half of the milk teeth “circumference” without correction will develop into permanent teeth “circumference”, and the symptoms will be aggravated; after the correction of milk teeth “circumference”, permanent teeth “circumference” will develop into permanent teeth “circumference”. After the correction of milk teeth, the possibility of permanent teeth “circumference” is reduced, even if it occurs, most of the symptoms are mild. The treatment of “circumcised teeth” during the replacement period: the treatment at this time is complex and varied, and may involve various kinds of orthodontic appliances for different situations, including movable orthodontic appliances, functional orthodontic appliances, fixed orthodontic appliances and extra-oral orthodontic appliances, etc., which is mainly to utilize the growth potential to change the amount and direction of the bone growth during the growth period of the children. Treatment of early permanent teeth “Baodi”: mainly refers to teenagers whose teeth have just been replaced, at this time, most of the development of jaws and teeth has been completed, mainly using fixed braces to disguise the skeletal deformity by changing the position of the teeth. At this time, there are a few patients who need combined orthodontic and maxillofacial surgery after adulthood due to the seriousness of the skeletal deformity. Treatment of adult “circumcision”: for adult “circumcision” with mild skeletal deformity, the position of teeth can still be changed by fixed braces to conceal the treatment; for adult “circumcision” with serious skeletal deformity, it can only be treated by fixed braces to hide the deformity; for adult “circumcision” with serious skeletal deformity, it can only be treated by orthodontic surgery. For adults with severe skeletal deformities, “circumcised sky” can only be treated by combined orthodontic and maxillofacial surgery. Below is a brief introduction to several commonly used braces and orthodontic methods for the treatment of “pericoronitis”, and the orthodontist will choose the appropriate braces and orthodontic methods according to the different conditions of the patients in the clinic: I. Simple movable orthodontic appliances are mainly used for “pericoronitis” during the period of milk teeth or replacement teeth, mainly made of composite resin, which is mainly used for the treatment of “pericoronitis” during the period of milk teeth or replacement teeth. Mainly used in the period of milk teeth or replacement teeth “periosteum”, mainly composed of composite resin and steel wire bending various curves, can be taken off and worn by the patient himself, generally require to wear the orthodontic appliances when eating. Second, the anterior traction orthodontic appliances for growth and development of patients, the age of the best in 8 ~ 11 years old. It is used to correct bony maxillary retraction and stimulate maxillary growth. The orthodontic device consists of two parts: intraoral parts and extraoral parts; intraoral parts are movable or fixed orthodontic devices; extraoral parts are mask traction brackets, which are connected by elastic rubber bands. Some of the patients with “circumcision” have upper and lower arch width discrepancy, which needs to be treated with arch expansion in conjunction with anterior traction. C. Head cap and chin pocket traction orthodontic appliance is suitable for patients with bony or functional “circumcision” during the growth and development period, and it is a common means to inhibit the growth of the lower jaw. It consists of head cap, chin pocket and elastic band. Frankel III Functional Orthodontic Appliance is mainly applied to the functional “geode” caused by the abnormal function of orofacial muscles and early bony “geode”, and the most suitable age is 7~9 years old for girls and 10~12 years old for boys. V. 2×4 orthodontic technology is mainly used for dental or mild bony “periosteum” during the period of teething, and the orthodontic appliance is only bonded on the erupted permanent teeth to lift the “periosteum” of the front teeth. Sixth, fixed orthodontic appliance masking treatment For the early permanent teeth and adult mild “pericoronitis”, the teeth can be moved through the conventional fixed orthodontic appliance in order to disguise the deformity of the bones. If there is overcrowding at the same time, tooth extraction may be needed. Seventh, orthodontic – orthognathic surgery combined treatment Severe bony “circumcision” needs to be treated with orthodontic – orthognathic surgery combined treatment in adulthood. Before the surgery, orthodontic treatment is carried out to align the teeth, which takes about one year; the hospitalization for the surgery is about ten days; after the surgery, the bite relationship of the teeth is finely adjusted through orthodontic treatment, which takes about half a year to one year; and it takes about two years in total.