Parotidectomy is a common clinical treatment for neoplastic lesions of the parotid gland. Generally speaking, if unilateral parotid gland is removed, the impact on human body is relatively small. In addition, one side of the parotid gland can play an obvious compensatory function, increase salivary secretion, and the patient will not have obvious symptoms of dry mouth. If the patient’s condition requires bilateral parotidectomy, the patient’s saliva secretion in the mouth will decrease significantly and dry mouth will occur. If the parotidectomy is accompanied by facial nerve injury, the patient will experience paralysis of facial muscles on the side of the nerve injury after the surgery, crooked mouth, accompanied by persistent salivation, and may have symptoms of pain. In addition, if there are residual tumor cells during parotidectomy, the recurrence of the tumor after the operation will cause more serious effects on the human body.