Protruding upper dental beds in girls of nine years of age can be treated by wearing orthodontic appliances and bad oral habits need to be corrected. Between 8 and 10 years old girls belong to the stage of tooth replacement, can be through wearing orthodontic appliances, such as fixed orthodontic appliances, movable orthodontic appliances and so on. It can inhibit the continuous development of the protruding alveolar bone, change the positional relationship between the upper and lower jaws, and improve the phenomenon of protruding upper jaw. After orthodontic treatment, in order to minimize the appearance of malocclusion, the girl’s oral habits should be carefully observed. If girls are found to have bad habits such as lip biting, pencil biting, tongue spitting, etc., parents should correct them in time. Orthodontic treatment can be carried out at all ages, if the girl’s teeth appear to be uneven, parents should take the girl to the regular hospital in a timely manner, under the guidance of the doctor’s treatment.