A combination jaw rest and ejector having a generally hollow wedge-shaped body with upper and lower channels in which a patient's teeth rest and which holds open the patient's mouth. The wedge-shaped body is placed in the patient's mouth on the side opposite that on which work is being performed. A suction hose is attached to the body and the side of the body facing the work site is perforated so that a relatively high volume of air may be drawn into the body through the suction hose, thus drawing, with the air, blood, spray, and debris and substantially preventing the discharge of these materials, which may carry disease transmitting factors, from the patient's mouth. In one embodiment, the body includes perforated salive collecting tube and/or a tongue depressor attached thereto. In a further embodiment, the body includes an illumination source therein to illuminate the interior of the patient's mouth. In another embodiment, a combination jaw rest and ejector includes an illumination source and is provided in a system which includes a combination air flow/light switch. In another embodiment, there is provided an illuminated jaw rest without means for evacuating material from the patient' s mouth.