Grinding mandibular angle is a very safe operation, and there are generally no side effects, because grinding mandibular angle does not need to remove any bones. As long as the thickness of the mandibular angle is thinned with professional tools, the purpose of widening can be achieved. During the operation, the mandibular angle can not be infinitely thinner, but has a certain value. In some irregular hospitals, there may be some side effects, such as nerve injury, mandibular marginal branch of facial nerve will be damaged during mandibular angle plastic surgery, which will lead to upper and middle paralysis of platysma, paralysis of descending and decompression muscles, asymmetric facial deformation and so on. Bleeding situation; Scar condition, etc.