A saliva ejector construction useful in the prevention of cross-contamination and the spread of infection between dental patients through the backflow of bacteria retracted through the saliva ejector tubing of evacuation systems used in the dental operatory, said saliva ejector comprising an elongated ejector tube having a proximal end being attachable to a suction or vacuum capability having factory pre-set calibrations for removing the unwanted build-up of saliva and debris from the inside of the patients mouth during the course of a dental procedure or operation, a distal end having a saliva ejector tip for insertion into the patients mouth to contact the unwanted build-up of saliva and debris during the course of said dental procedure or operation, and an aperture disposed within a wall of the elongated ejector tube to control and minimize the occurrence of pressure differentials within the tubing of the evacuation system when a patient closes their lips around said saliva ejector tip placed within the patients mouth, the aperture being a vacuum release and control aperture having a diameter of from about 0.0135 inch to about 0.038 inch so as to achieve and maintain a suction force equal to from about 79% to about 96% of the factory pre-set values of the evacuation system of the modern dental operatory.
