DENTAL ILLUMINATING DEVICE, MOUTH OPENER AND DENTAL LIGHTING SYSTEM

PROBLEM TO BE SOLVED: To perform a decay observation even in a state where the inside of the oral cavity is brightly lighted with a shadowless lamp while preventing illuminating light for decay observation from being emitted in the outside of the oral cavity.SOLUTION: The dental illuminating device 2 includes: an insert unit 5 to be inserted into the oral cavity; a lighting unit 6 provided in the insert unit 5 to emit illuminating light for irradiating teeth A; a sensor 7 disposed closer to the base end of the lighting unit 6 of the insert unit 5 than to the emitting end thereof to detect magnetism or specific light; and a control unit 8 which controls the emission of illuminating light from the lighting unit 6 based on the detection result of magnetism or specific light by the sensor 7.