Ohio Rev. Code Ann. § 4715.53
(B) The board shall review all applications received and issue a dental x-ray machine operator certificate to each applicant who submits evidence satisfactory to the board of one of the following:
(3) The applicant has successfully completed an educational program consisting of at least seven hours of instruction in dental x-ray machine operation that meets either of the following requirements:
(C) A certificate issued under this section expires two years after it is issued and may be renewed if the certificate holder does both of the following: