Abstract: An oral diagnostic device includes a device main body including an optical transmitting and receiving module; and a probe that is detachably coupled to the device main body, irradiates light received from the optical transmitting and receiving module into an oral cavity, receives reflected light from the oral cavity, and transmits the received reflected light to the optical transmitting and receiving device. The optical transmitting and receiving module includes an optical element module including a light-emitting element and a light-receiving element, a single first optical fiber that transmits the light generated by the light-emitting element to the probe, and a plurality of second optical fibers that transmit the reflected light received from the probe to the light-receiving element. The single first optical fiber and the plurality of second optical fibers are coupled to each other at the other sides thereof to form an optical fiber coupling part.

Abstract: A method of managing teeth performed in a processor-based device includes: displaying a first oral measurement image including tooth measurement images in a tooth shape to measure state information of each of user's teeth; receiving state information of a target teeth of the user measured from a tooth diagnostic device; receiving a selection signal input for selecting a first tooth measurement image from among the tooth measurement images; matching state information of the target tooth with state information of the first tooth measurement image; and representing the state information of the first tooth measurement image in the first oral measurement image.