For mild convex mouth, braces can usually correct or improve it. For severe convex mouth, braces may not be able to correct it depending on the situation, and orthognathic surgery is needed to correct it. 1. Can be corrected. Convexity is often caused by malocclusion, overcrowding of teeth, deep coverage can cause convexity of the mouth, at this time, orthodontic treatment can be carried out to align the teeth in the arch, inwardly retracted anterior teeth, generally can be corrected convexity of the mouth or to improve the situation of convexity of the mouth. 2. Cannot be corrected. If the convexity of the mouth is caused by overdevelopment of the jawbone, and the alignment of the teeth does not affect the convexity of the mouth, orthognathic surgery is needed to trim the jawbone that is too convex. Whether braces can correct a protruding mouth can only be determined by examining the cause of the protruding mouth at the hospital.