The lower teeth bite on the outside of the upper teeth, and some people only have their teeth upside down; Some people not only have malocclusion of teeth, but also have deformity of facial bones, which is called skeletal malocclusion. It is characterized by hypoplasia of maxilla-backward, overdevelopment of mandible-forward, which leads to depression in the middle of the face and crescent-shaped profile, which affects the appearance and function. The specific cost of calibration depends on the calibration scheme.