One embodiment of the present invention provides an online oral health state diagnosis method comprising: a hospital information transmission step of transmitting information on at least one dental hospital to a patient terminal when an information transmission request is received from the patient terminal; a medical care request transmitting step of transmitting medical care request information to a first hospital terminal of a determined dental hospital when a dental hospital is determined by information transmitted from the hospital terminal; a first rights granting step of granting, to a second hospital terminal, access rights for first diagnosis information when the first diagnosis information on the medical care request information is received from the first hospital terminal; a second rights granting step of granting, to the first hospital terminal, access rights for received second diagnosis information when second diagnosis information corresponding to the first diagnosis information is received from the second hospital terminal; and a third rights granting step of granting, to the patient terminal, access rights to third diagnosis information when the third diagnosis information corresponding to the second diagnosis information is received from the first hospital terminal.
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