Abstract: A bite block intended primarily for use with upper gastrointestinal endoscopy. The bite block comprises a unitary fabrication that fits into the mouth between the teeth or dental ridges and has a central passageway large enough to accommodate a gastroscope. The bite block also has a surface which lies exterior to the oral cavity and extends around the outer surface of the lips. The bite block also has a suction device which can be attached to a standard suction machine via flexible tubing or with an intermediary hollow wand. The suction device extends through the bite block into the intra-oral portion thereof where it forms an angle and allows suction drainage of pooled oral fluids from the cheek cavity. The interior tip of the suction device has multiple slit like openings circumferentially arranged to allow suction drainage of oral fluids without becoming occluded by the oral tissues.