Possible sequelae are: 1. During the left-right asymmetric surgery, it is impossible for doctors to accurately calculate the width of the removed (polished) bone, and the face of the human body itself is not completely symmetrical. If the doctor is unskilled or careless, it will lead to an increase in the width asymmetry of the two sides. Therefore, experienced doctors should not only be familiar with their facial skeletal structure, but also take X-rays (or magnetic vibrations) for operators before operation to clearly understand their unique skeletal structure. 2. Postoperative hematoma Any operation will involve a large number of blood vessels and nerves. Even if the bleeding is completely stopped, postoperative bleeding is easy to occur. So generally speaking, when surgical suture is performed, the doctor will place a drainage tube to draw out the congestion in the wound. If the drainage tube is improperly placed, or the hemostasis is not done well, a large amount of congestion is likely to accumulate on the face after operation, resulting in hematoma. 3. Joint Dislocation Whether it is mandibular surgery or zygomatic surgery, it will encounter the temporal joint, which is near the temple and is the position where the chin hangs. Therefore, during the operation, the doctor should hold the surgeon's chin hard and keep the temporomandibular joint tense. If you don't pay attention, it will cause joint dislocation, which is often called "mandibular prolapse". 4. Facial numbness When performing surgery on the mandible, it is easy to hurt the mandibular nerve. This nerve directly dominates the perception of lower teeth and lower lip, and is the chief culprit of postoperative pain. If pulled during operation, it will cause temporary numbness of lip perception after operation. And once it is hurt, it may cause permanent numbness. 5. Improper facial muscle contortion surgery, once it hurts the sensory nerve, it will cause numbness in the feeling, and hurting the facial nerve will involve facial muscle movement. For example, when doing cheekbone surgery, some nerves grow close to the periosteum. If the doctor fails to properly separate the nerve from the periosteum, there will be serious consequences such as eyebrow lifting disorder and unilateral frontal muscle paralysis. -risk interpretation "bone grinding" risk 1. Facial numbness is easy to hurt mandibular nerve during mandibular surgery, which directly controls the perception of lower teeth and lips. Is the chief culprit of postoperative pain. If it is pulled during the operation, it will cause temporary numbness of lip perception after operation. And once it is hurt, it may cause permanent numbness.