Effectiveness of Transcutanclus electrical acupoint stimulation combined with acupoint application on radiation-induced xerostomia in patients with oral cancer

INTERVENTION: control group:transcutaneous electrical acupoint stimulation;Experimental group:transcutaneous electrical acupoint stimulation Combined Application;Blank control group:Routine Care; CONDITION: Oral cancer PRIMARY OUTCOME: Xerostomia Questionnaire(XQ); SECONDARY OUTCOME: salivary flow rate;QLQH&N35; INCLUSION CRITERIA: 1. Oral cancer with radiation and histological confirmation.Adult > 18 years of age, without tumor recurrence. 2. with an anticipated survival of more than si Xmonths and Karnofsky performance status = 60. 3. Able to give informed consent and ethics committee approval. Patients communicate normally and (verbally or in writing). 4. Planned intensity‐modulated radiation therapy (IMRT), with or without concurrent chemotherapy or induction treatment, no parotid duct ligation or excision, and best attempts to minimize the bilateral parotid. One parotid gland receives an average dosage of less than 20 Gy, while both parotid glands get an average dose of less than 25 Gy.