The board shall adopt a program of continuing education for dentists and a program of continuing education for dental hygienists. After January 1, 2002, at the time of reregistration of license as a dentist or dental hygienist, each licensee shall present to the board evidence of compliance with the program of continuing education applicable to their profession. In addition to any other continuing education requirement adopted by the board, after January 1, 2016, each licensee who is a dentist shall present to the board evidence of having completed at least six hours of ethics training during the previous two years for each biennial renewal period. Failure to reregister and present evidence of compliance shall constitute a forfeiture of license, which may be restored only upon written application therefor and payment to the board of a restoration fee.