Parotidectomy is a common clinical treatment for neoplastic lesions of the parotid gland. In general, if the parotid gland is removed unilaterally, the impact on the body is relatively small. In addition, one side of the parotid gland can play a significant compensatory function and increase salivary secretion, and patients will not experience significant dry mouth symptoms. If the patient needs to have bilateral parotidectomy, the salivary secretion in the patient’s mouth will be significantly reduced and dry mouth will occur. If the facial nerve is damaged during parotidectomy, the patient will experience paralysis of the facial muscles on the damaged side of the nerve, distorted mouth, continuous salivation and painful symptoms after surgery. In addition, if tumor cells are left behind during parotidectomy, the recurrence of the tumor will have a serious impact on the body after surgery.