A receding jaw with a convex mouth can be improved by orthodontics if it is dental, and needs to be corrected by orthognathic surgery if it is bony. Jaw retraction is a jaw deformity caused by incomplete jaw development or congenital lack of lower front teeth, including dental and bone. 1. Dental recession of the jaw can be treated by orthodontics, which is to restore the stability and aesthetics of the oral and maxillary system by adjusting the abnormal relationship between the jaws and teeth as well as the nerves and muscles connecting them, and usually takes two years. 2. Chin retraction caused by bone development problems is bony, bony chin retraction patients are mostly family hereditary, manifested as straight teeth, normal occlusion, jaw growth and development is insufficient, and basically no chin shape, forced to close their mouths, the lower lip and chin below the walnut-like lines bulging, and accompanied by the front teeth deep cover and deep overlay, bony chin retraction correction needs to be through the orthognathic surgery. The distinction between bony and dental needs to go to the stomatology department of the regular hospital to take panoramic and lateral radiographs, and by taking some measurements, the professional orthodontist will determine which kind of misalignment is present. If you are a patient with jaw retraction problem, it is recommended to go to a regular hospital for consultation.