There are many reasons for a protruding mouth, including dental convexity and bony convexity, which can be corrected by braces or orthognathic surgery. 1. Dental Convexity: If there is a condition of dental convexity, it will lead to a protruding mouth, which is usually corrected by wearing braces in the clinic. Braces are used to correct the alignment of the teeth and play an important role in orthodontic treatment to improve the convexity of the mouth caused by the teeth. 2. Bony Convexity: Bony Convexity is usually caused by maxillary protrusion and mandibular protrusion leading to curved lips, which requires orthognathic surgery to adjust the relationship between the dental arches and the jaws to normal, and establish a good relationship between the teeth and jaws, so as to improve the convexity of the mouth. Mouth protrusion will affect the aesthetics, if you want to improve this situation, you should go to a regular hospital stomatology department, according to their own to develop a suitable program. If you choose to wear braces, you need to pay attention to daily hygiene and keep your teeth and braces clean. If you choose to do orthognathic surgery, you need to pay more attention after surgery to avoid complications.