Correct all kinds of bad habits, treat systemic diseases including nasal cavity and respiratory system diseases, and remove supernumerary teeth.

2. Correct malocclusion

(1) The main objectives of orthodontic treatment are: ① to relieve the crowding and local dislocation of dentition; ② Reduce the deep overbite of anterior teeth; ③ Reduce the deep coverage of anterior teeth; (4) Correcting the occlusal relationship of posterior teeth.

(2) Tooth extraction therapy has four main functions: ① eliminating dental arch crowding; ② Upper dental arch, which provides clearance for anterior teeth to move backward; ③ Lower dental arch can provide clearance for intermaxillary traction and molar correction; (4) provide clearance for relieving deep coverage. Orthodontics after tooth extraction mainly involves relieving crowding, reducing overbite coverage and correcting posterior tooth relationship.

(3) Reducing the coverage is usually accomplished by adduction of the front section of the upper arch, which requires enough clearance for adduction of the arch. In a few cases, the reduction of coverage is accomplished by the forward movement of the lower incisors. When the teeth are slightly irregular, a simple oblique movement of the front teeth can make a good relationship between the front teeth. When it is necessary to reduce the size of the first bicuspid, generally pull the bicuspid to move away from and close to the second bicuspid, and then move the upper incisor to the lingual side to reduce the coverage. If the coverage is not large, it can be corrected with movable appliances. If the coverage is large and a large degree of inclination is needed, external traction can be used to strengthen anchorage or intermaxillary traction with fixed appliance can be used to correct it.

(4) If possible, the posterior teeth should be corrected to achieve a neutral relationship. Under limited conditions, it is better to form a far-end relationship with the opposite tip than to form a far-end contact relationship with the tip. There are four basic methods to achieve the above orthodontic goals: ① The distal movement of the posterior teeth of the upper teeth forms a neutral relationship, which requires a larger jaw to accommodate all teeth and more distal movement, and often requires intermaxillary traction or extraoral traction, and occasionally succeeds after the second permanent molar of the upper teeth is removed. ② The neutral relationship formed by the proximal movement of the lower posterior teeth is often achieved by extracting four first bicuspids from the upper and lower jaws. Intermaxillary traction can be used to move the upper anterior teeth backward and the lower posterior teeth forward. ③ Maxillary posterior teeth move proximally to form cusp fossa with distal-distal relationship, which is mainly suitable for Angle Class Ⅱ Class Ⅰ malocclusion with complete molar arch with distal-distal relationship. The first bicuspid teeth were extracted from each side of the maxilla, and the upper front teeth were moved backward and the upper rear teeth were moved forward to the extraction space through intra-jaw traction. ④ The mandible is pulled forward to form a neutral relationship, which is mainly suitable for functional anterior teeth with basically normal maxilla and complete lower dental arch but in a far-middle-back contraction position. Functional appliances can be used to correct the relationship between distal molars.

3. Severe skeletal deformity

For adult patients with severe skeletal deformity and deep overbite of anterior teeth, orthognathic surgery and orthodontics are needed to succeed.

Orthodontic search: Guiyang, Nanning, Guilin orthodontics, one-time price 5000 yuan, for reference.