During the recovery period after mandibular angle osteotomy, there will be swelling of the face in different degrees, which will gradually subside in 3-7 days, and the suture can be removed about one week after operation. But it takes about 1 month to completely reduce swelling. From 3 to 6 months, due to the changes of attachment position and muscle tension, the masseter muscle itself will rebuild itself and shrink, so the best effect is about 6 months.