After resection of parotid tumor, the mouth is a bit crooked, which may be caused by facial nerve injury or local anesthesia is not fully metabolized. 1. Nerve injury: Due to the abundance of facial nerves, there may be different degrees of damage to the surrounding facial nerves during the resection of parotid tumors, which may lead to symptoms such as crooked mouth or slurred speech after the operation, which can be protected by taking medicines such as methylcobalamin or Vitamin B, and can be gradually recovered in 2~3 months after the operation. 2. Anesthesia is not metabolized: in a short period of time after surgical resection, the corners of the mouth appear crooked, need to consider the local anesthesia is not completely metabolized and caused by muscle stiffness. Because the anesthetics used in the operation need to be metabolized gradually in the body, so in the process of residual anesthetics will still appear local nerve paralysis or muscle stiffness and other phenomena, which will lead to skewed corners of the mouth or poor response. Such phenomenon will usually be gradually relieved in 1~2 weeks after the operation. If the mouth is a little crooked after parotid tumor removal, you can go to the hospital for examination in time and choose the appropriate neuroprotective drugs under the doctor’s guidance.