Abstract: The invention is a device for use as a prop to hold the mouth open which consists essentially of a bite block with an elongated portion that is deflected and to provide a physiologically shaped elongated portion extends along the buccal border of the tongue to form a tongue depressor and light reflector as the bite block is held in position. The retaining arm, tongue guiding hole and the flange retain the patient's tongue in the bottom cavity of the patient's mouth.