Acupuncture Mechanism in Relief of Gag Reflex

Inclusion Criteria: 1. Healthy volunteers aged between 20-40 years old with an American Society of Anesthesiologists physical status of I to II naïve to acupuncture 2. Participants without previous opioid and psychotropic medication 3. Without use of recreational drugs 3 days prior to study sessions 4. Without systemic disease or local skin lesions at the sites of acupuncture 5. Without drug allergy to local anesthetics, especially EMLA preparation 6. Participants who have given written informed consent Exclusion Criteria: 1. Local skin infection at the sites of acupuncture 2. Aged \< 20 or \> 35 years 3. History of drug allergy to local anesthetics 4. Participants who are unable to understand the consent form or to use numeric rating scale NRS-11 Discontinuation Criteria 1. Any adverse effects during study session 2. In case of local or systemic infection 3. In case if subject will withdraw from participation in this study at any time, for any reason, specified or non-specified, and without penalty or loss of benefits