Mouth convexity due to mouth breathing can usually be restored through aggressive corrections such as orthodontics, maxillary osteotomy, and bimaxillary surgery. 1. Orthodontics: If the mouth is convex with only the teeth protruding forward, it can generally be improved by orthodontics. 2. Maxillary osteotomy: Generally, the convexity of mouth caused by mouth breathing can also be corrected by maxillary osteotomy, by moving the root bone and teeth in that position in a general way, and the actual effect is also good. 3. Bimaxillary surgery: this method allows the mouth to return to its normal position by amputating the bones of the upper and lower jaws. If the lower jaw has a problem such as a diastema or retrusion, it will need to be corrected at the same time. Therefore, if you have the bad habit of breathing with your mouth open, you should change it in time. If you have rhinitis, nasal polyps or other symptoms that cause mouth breathing, you should consult a doctor in time to find out the cause of the disease and then treat it.