The convex mouth may be caused by anterior protrusion of teeth, mandibular retraction, and anterior displacement of the maxilla, which can be improved by orthodontic surgery and orthognathic surgery. 1. Anterior protrusion of teeth: convex mouth may also be caused by anterior protrusion of teeth, patients can follow the doctor’s advice to choose orthodontic surgery to improve. Through orthodontic devices to improve the coordination between facial bones, maxillofacial nerves and muscles, and teeth, adjust the abnormal relationship between upper and lower teeth, upper and lower jaws, to achieve the effect of balancing the relationship between the mouth and jaws, which can effectively improve the situation of convex mouth. 2. Mandibular retraction and maxillary advancement: If the convex mouth is caused by mandibular retraction or maxillary advancement, it can be improved by orthognathic surgery. By amputating the upper and lower jaws and the corresponding zygomatic bones around them, the jaws can be moved to a relatively normal position, thus correcting the convexity of the mouth. If you have a convex mouth, you should go to a regular hospital for treatment under the guidance of a doctor. During the treatment period, it is necessary to pay attention to oral hygiene and avoid eating hard food, so as not to affect the therapeutic effect.