Medical and dental apparatus, device, instrument, equipment, product, namely, bite blocks, mouth props, tissue retractors, cheek retractors, tongue retractors, tongue guards, saliva suction device, saliva ejectors, saliva evacuators, oral aspirators, dental aspirators; Dental dams; Dental device that expands the mouth to improve the field of view inside the mouth, and extracts saliva from the work area inside the mouth; Dental instruments, namely, bite blocks, mouth props, tissue retractors, cheek retractors, tongue retractors, tongue guards, saliva suction device, saliva ejectors, saliva evacuators, oral aspirators, dental aspirators; Dental instruments for use in suctioning oral cavity, retracting tissues, simultaneous isolation of quadrants on same side of the mouth