ㆍImprove the airway opening by chin (lower jaw) lifting effect. ㆍWhen you put the air-piece in your mouth, it makes your mandible move forward naturally, and your airway opens larger. ㆍReduce the risk of hypoxic accidents by increasing oxygen saturation during sedation endoscopy. ㆍReduce the risk of tooth damage during the endoscopy with a shape tailored to the anatomical structure of the oral cavity.