Mandibular osteotomy is one of the commonly used methods in chin plastic surgery. No matter whether there is no chin or protruding chin, people with ugly chin can move forward through chin osteotomy and have a good chin in their dreams. Let's take a look at the process of jaw osteotomy moving forward. Chin osteotomy forward experts pointed out that chin osteotomy forward surgery has helped many friends improve their chin problems. Mandibular osteotomy and chin plasty are suitable for moderate and severe cases of McCarthy ⅰ, ⅲ and ⅳ deformities. This operation is also suitable for correcting mild mandibular retraction deformity, and the occlusal relationship is basically normal. The forward method of mental osteotomy is to cut the mental bone horizontally and push it forward to increase the mental protrusion. The surgical incision is mostly at the mucosa of the inferior gingival sulcus. During the operation, the lower lip and mucoperiosteum turned down and then turned up, and degloving was performed to expose the chin. Then cut the mental bone horizontally with a saw to connect it with the lingual soft tissue to form a soft tissue bone flap, then move it forward to a suitable position and fix it again with a small screw or steel wire. Before suture, a relaxed transverse incision should be made on the periosteum to prolong the mucoperiosteal flap, and then the layers should be sutured in turn and bandaged under pressure. For moderate and severe type I patients with only shortened chin length, simple horizontal jaw osteotomy and chin plasty can be selected; For type ⅳ patients with shortened sagittal diameter and increased longitudinal length of chin, it is feasible to move the horizontal osteotomy block forward for chin plasty. Attention should be paid to the advancement of mental osteotomy. There are oral or extraoral methods for the advancement of mental osteotomy. During the operation, we should pay attention to protect the adhesion of muscle and soft tissue at the lower edge of mental, and try our best to reduce unnecessary peeling around mental hole. According to the characteristics of micro-mental deformity measured and analyzed before operation, the plane and angle of mandibular osteotomy should be designed, and the osteotomy line should be designed below the level of mental foramen and root tip to avoid damaging mental nerve and root tip. In order to keep the close contact and firm and reliable fixation between bone fragments, titanium alloy steel plate screws or stainless steel wires can be used for internal fixation.