The way to correct a twelve year old girl’s jaw should be determined on a case-by-case basis, and is generally based on the application of orthodontic appliances, and may also involve surgery if necessary. Reverse jaw is mainly related to genetic factors and environmental factors, which will not only make the patient have difficulty in chewing and other health problems, but also affect their own image. If a twelve year old girl has a dental cause for the reflexion, the reflexion can usually be corrected by means of an orthodontic appliance to alleviate the reflexion symptoms. If a twelve year old girl has a bony antomandibular or jaw deformity that is more serious, she will need to be treated with orthognathic surgery. Patients should keep their mouth clean and hygienic in their normal life, and develop the habit of brushing their teeth in the morning and evening. If the twelve-year-old girl has the phenomenon of anti-mandibular, it is recommended to go to the regular hospital for examination and treatment in time.