All beauty lovers have heard of the thesis that “a straight line from the tip of the nose to the chin and a mouth that exceeds it is a convex mouth”. Of course, this is also divided into a slight convex mouth or a serious convex mouth. Today we are going to talk about convex mouth. What are the types of convex mouths? 1. Excessive protrusion of the upper dental bed and teeth; 2. Normal upper and lower jaws with protruding teeth; 3. Straight teeth with protruding dental bed; 4. All protruding dental bed and teeth. What are the causes of a protruding mouth? One type is dental: teeth grow outward or crowded, causing the incisors to be pushed out to the front of the line, arching the lips out. The other is bony, which may be due to poorly developed upper jaw, which is characterized by a sunken midface, or what many people call a “shoe-pulled face”; or an overdeveloped upper jaw, which has a protruding alveolar bone; or one that includes both of the above factors; in addition, even if the upper jaw is normally developed, there is another problem that can make the mouth appear convex, which is a receding chin. What are the surgical options to improve a convex mouth? Surgery needs to be tailored to the specific cause of the protruding mouth. If the protruding tooth is the only cause of the protruding mouth, then orthodontic treatment through tooth extraction can improve the situation, but if it is a complex protruding mouth phenomenon, it needs to be determined on a case-by-case basis. 1.Osteotomy of the upper jaw In general, the term for the operation of a protruding mouth is: anterior osteotomy of the upper jaw (ASO, anteriorsegmentalosteotomy), which is a method of removing a tooth behind the canine and then amputating the bed bone in the area and moving the bed bone and teeth in the area as a whole. 2.Double jaw surgery is required when you have had a tooth extraction and cannot have another tooth extraction, when you have a sunken feeling after a normal jaw surgery because the degree of protrusion is not serious, when your lower jaw is protruding at the same time, or when you have a long face and a large number of teeth exposed. 3.Triple jaw surgery When chin osteotomy and double jaw surgery are performed together, a high degree of skill is required. In the case of a severe convex mouth and a severe short chin, triple jaw surgery is required. It is important to note that although it sounds simple, the actual operation requires very strict skills of the surgeon, and any slight negligence may cause sequelae of the operation, so it is important to investigate and compare more before deciding on the hospital.