Okla. Stat. tit. 59, § 396.5

All licenses issued by the Board shall expire on the 31st day of December of each year. The Board shall issue a renewal for such license without further examination upon the payment of a renewal fee as required by Section 396.4 of this title. A funeral director or embalmer who fails to apply for a renewal license for a period of three (3) years or more shall be reinstated by taking a written and oral examination, as required by the Board, and by paying a fee and the current years' dues as required by Section 396.4 of this title.