When the protruding mouth is less than 4mm and the face looks very long, doctors at BK Plastic Surgery Hospital in Korea will use the method of bimaxillary surgery to return the bones of the upper and lower jaws to the correct position through osteotomy. If there are some problems, such as oral process, asymmetrical face and short chin, and at the same time, the chin should be corrected, the most natural and ideal surgical effect can be achieved through bimaxillary surgery.