Due to improper operation, it is very likely that neuromandibular injury will occur during the operation, resulting in facial expression loss or asymmetry. Due to the swelling of the wound or the arterial injury caused by surgical traction, it causes massive bleeding and facial paralysis. Scar, once the incision is exposed, it will lead to scar on the mandibular angle. The face is sunken and the skin is slack. Because the support suddenly lost during bone cutting is taken away by Pingping, if the skin can't produce collagen by itself, it will lead to facial sagging. "Bone" and "muscle" can not be fused, with long recovery period, inflammation and infection, and facial muscle necrosis. South Korea's GUGISO double-membrane regeneration technology can stimulate the secondary development of periosteum and sarcolemma damaged during operation, promote the opening of nutrient channels in the double-membrane, strengthen the blood vessel wall, and make the absorbed nutrients reach the focus, thus repairing the damaged cell fibers and bones.