N.C. Gen. Stat. § 86B-66

An electrology or laser hair practitioner instructor's license shall be renewed annually. On or before the date the current license expires, the applicant must submit an application for renewal of licensure on a form approved by the Board, meet criteria for renewal established by the Board, and pay the required fee. Any person whose instructor's license has expired for a period of three years or more shall be required to take and pass the instructor's examination before the license can be renewed.