A convex sideways mouth can be corrected by wearing orthodontic braces or orthognathic surgery, depending on the specific cause of the convexity. Dental problems such as uneven teeth and overcrowding may lead to odontogenic malocclusion, resulting in a convex mouth, which can be corrected by wearing orthodontic braces; if the mouth is convex due to prominent development of the maxillofacial skeleton, orthognathic surgery is needed according to the specific conditions of the upper and lower jaws; if the mouth is convex with both dental problems and prominent maxillofacial skeleton, it can be treated by orthodontic orthognathic surgery. Convexity may also be caused by lip hypertrophy, which can be improved by surgically cutting off the excess soft tissues of the lips. If you want to improve your bulging mouth, you should go to the hospital for diagnosis and take professional advice.