D.C. Mun. Regs. tit. 17, § 9202
9202.1 A teacher's license in dentistry and a teacher's license in dental hygiene shall expire on the earlier of:
9202.2 The holder of a teacher's license in dentistry or dental hygiene shall surrender the license to the Board within thirty (30) days of ceasing to be a full-time or part-time faculty member at the institution named on the license.
9202.3 Subject to § 9202.4, a teacher's license in dentistry and a teacher's license in dental hygiene issued pursuant to this chapter shall expire at 11:59 PM of December 31st of each odd-numbered year.
9202.4 If the Director changes the renewal system pursuant to § 4006.3 of Chapter 40 of this title, a teacher's license in dentistry and a teacher's license in dental hygiene issued pursuant to this chapter shall expire at 12:00 midnight of the last day of the month of the birthdate of the holder of the registration or other date established by the Director.
SOURCE: Final Rulemaking published at 63 DCR 13701 (November 4, 2016).