Macrognathia: Most of them are congenital. When suffering from jaw bone, it will be accompanied by maxillary protrusion (the maxillary arch is large and the teeth protrude forward); Macrognathia is accompanied by mandibular protrusion. No matter what the symptoms are, the occlusion of the teeth is not good.

Microjaw deformity: It is congenital, and many of them are caused by maxillary and mandibular dysplasia caused by trauma and jaw inflammation in early childhood. Microjaw is commonly seen in patients with cleft palate. From the appearance, mandibular protrusion, from the side, looks like a bird's face, as if there is maxillary protrusion.

Jaw deformity can be treated with plastic surgery, and abnormal occlusion of teeth should be corrected at the same time.