Credits earned in excess of thirty hours in a

24-month renewal period

do not carry over into the following period. A maximum of 5 hours each in a renewal period may be obtained for faculty overseeing student dental hygiene or expanded function dental hygiene clinics, dental public health continuing education activities, well-being or substance abuse continuing education activities or ethics and professionalism continuing education. A minimum of 2 hours in a renewal period must be obtained in each area for which a licensee holds an expanded function permit