Abstract: A removable dental appliance is disclosed which props open the mouth for dental work while maintaining a dry and wide field of operation. The appliance includes a flexible tubular frame having upper and lower U-shaped sections which are adapted to fit into the patient's mouth outside of the upper and lower dental arches in surface contact with the cheeks. Cheek deflectors are removably secured between upper and lower U-shaped sections of the frame to force the patient's cheeks outward to prevent occlusion of the field of operation. The cheek deflectors are constructed from a flexible material which is curved generally outward to a contour approximating the cheek surface of the mouth. A tongue deflector is secured to the front of the bottom U-shaped section of the tubular support frame. The frame is provided with a plurality of orifices which permit the removal of saliva from the mouth when a vacuum source is applied to a saliva ejector which is coupled to the tubular frame.