Mouth convexity may be caused by maxillary protrusion, mandibular retrusion, teeth protrusion, etc. It can be improved by orthognathic surgery and orthodontic treatment. 1. Maxillary protrusion, mandibular retrusion: If the mouth is convex due to maxillary protrusion or mandibular retrusion, it can be improved by orthognathic surgery. By abrading, reducing or moving the facial bones, the facial shape will be changed to improve the convexity of the mouth. 2. Anterior protrusion of teeth: A convex mouth can also be caused by anterior protrusion of teeth, which can be improved by orthodontic treatment. By applying the force generated by the orthodontic appliances to the teeth or by promoting the development of the jawbone through the orthodontic appliances, the teeth can be moved, thus improving the convexity of the mouth. If you want to improve the convexity of your mouth, it is recommended to go to a regular hospital and choose the appropriate improvement method under the guidance of your doctor. During the treatment period, it is recommended to eat less hard food so as not to affect the therapeutic effect. Meanwhile, it is necessary to maintain oral hygiene and brush the teeth diligently, which can reduce the appearance of gingivitis, tooth demineralization and other complications.