To determine whether face slimming injury to the nerve, can be considered from the following two aspects: First, feeling, facial nerve has the role of sensation, but also the usual cold, heat, pain, etc. are felt by the nerve conduction, if the operation is done after feeling numbness or insensitive to the touch of pain and hot and cold, or less than before, it may be possible to damage to the nerve. Second, movement, the nerve can dominate the movement of the facial muscles, static can produce the normal shape of the face, dynamic can produce a variety of expressions, if the postoperative effect similar to facial paralysis, is certainly damage to the nerve, after the operation to produce a smile or other expression of rigidity or can not make expressions, so also is a manifestation of damage to the nerve.