Inclusion Criteria:  VAS thirst assessment form score ≥ 4 points Age 20-75 years old Anesthesia risk assessment grade Amersican Society of Anesthesiologists: I~III:The first level (ASAⅠ)-healthy people, except for surgical corrections, without any systemic disease patients, such as patients with simple appendicitis (pre- and post-operative mortality rate 0.06~0.08%); Level 2 (ASAⅡ)-Patients with mild systemic disease but no functional impairment, such as those over 70 years old without any disease, or a small cold, HTN or DM but well-controlled diseases (pre- and post-operative mortality 0.27~0.4%); Level III (ASAⅢ)-Moderate to severe systemic disease and cause partial dysfunction, such as HTN or DM but not well controlled, or have cardiovascular complications (stroke, myocardial infarction, angina, etc.) (The mortality rate before and after surgery is 1.8~4.3%). Conscious (GCS: 15 points). Muscle power ≥ 4 points. Anesthesia recovery score Aldrate score ≥8 points: Consciousness: Fully awake, in full contact; Mobility: Able to move 2 extremities on command; Breathing: Able to breathe deeply and cough freely; Circulation: BP ±20-49% of pre-anesthetic level; Skin color: Normal. Informed consent.  Excluded Criteria:  Those who underwent head and neck surgery this time or had a history of head and neck surgery: Acoustic immittance testing, Acoustic voice assessment, Aerodynamic voice assessment, Airway reconstruction, Auditory brainstem implant, Auditory evoked potential test, Aural rehabilitation, Balloon sinuplasty, Blepharoplasty, Botox injections, Bronchoscopy, Brow lift, Canalith repositioning procedure, Chemical peel, Cleft lip repair, Cleft palate repair, CO-2 laser treatment, Cochlear implants, Computerized dynamic posturography, Cosmetic surgery, Custom ear protector fitting, Dental implant surgery, Electroacoustic assessments of hearing aids, Electromyography (EMG), Electronystagmography, Endoscopic sinus surgery, Esophagoscopy, Face-lift, Facial fillers for wrinkles, Facial fracture repair, Facial nerve rehabilitation, Facial reconstruction, Facial rejuvenation, Fat grafting, Flexible endoscopic evaluation of swallowing with sensory, testing (FEESST), Hearing aid fitting, Hearing conservation services, Hearing implant surgery, Hearing monitoring services, Hearing test, Hearing test for children, Infant hearing screening, KTP laser treatment, Laryngeal reinnervation, Laryngoscopy, Laryngotracheal reconstruction, Larynx transplant, Laser resurfacing, Lip surgery, Mastoidectomy, Maxillomandibular advancement surgery, Microlaryngoscopy, Microvascular reconstruction, Middle ear reconstruction, Minimally invasive surgery, Nasal septal reconstruction, Nasal valve repair, Neck lift, Newborn hearing screening, Nose reconstruction, Otoacoustic emissions (OEA) test, Otological microsurgery, Otoplasty, Parathyroidectomy, Parotid gland surgery, Parotidectomy, Pharyngeal manometry, Professional voice evaluation, Rhinoplasty, Robotic surgery, Rotary-chair testing, Scar revision, Septoplasty, Singing voice evaluation, Sinus surgery, Skin cancer reconstruction, Speech-language pathology evaluation, Stapedectomy, Stroboscopy, Swallowing exercises, Swim mold fitting, Thyroid surgery, Thyroidectomy, Thyroplasty, Tinnitus assessment, Tonsillectomy, Trachea transplant, Tracheostomy, Transnasal esophagoscopy, Transnasal pituitary surgery, Transoral laser microsurgery, Transoral robotic surgery, Turbinate surgery, Ultrasound-guided fine-needle aspiration, Ultrasound-guided surgery, Upper airway stimulation therapy (Inspire device), Uvulopalatopharyngoplasty (UPPP), Vestibular rehabilitation, Vestibular testing, Videofluoroscopic swallowing study, Video laryngoscopy, Vocal cord injection, Voice therapy. A history of Diabetes. A history of Hyperthyroidism. A history of heart failure Younger than 20 years old or older than 75 years old. Damaged oral mucosa or lips.