A bite block intended primarily for use with upper gastrointestinal endoscopy comprises a unitary body that fits into the mouth between the teeth or dental ridges. The bite block includes 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. A suction wand is releasably connected to the body and extends 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 wand has a terminal opening as well as multiple circumferentially arranged secondary openings adjacent the terminal opening all of which allow suction drainage of oral fluids with diminished occlusion by the oral tissues.