California Code, Business and Professions Code - BPC § 1642

(a) The special permitholder shall file a copy of his or her employment contract with the board.  The contract shall contain the following provision:

That the holder understands and acknowledges that when his or her full-time or part-time employment is terminated at the dental college, his or her special permit will be automatically revoked and that he or she will voluntarily surrender the permit to the board and will no longer be eligible to practice unless or until he or she has successfully passed the required licensure examination as provided in Article 2 (commencing with Section 1625).

(b) The holder shall be employed as a full-time or part-time professor, an associate professor, or as an assistant professor at a California dental college approved by the board. “Full-time employment” as used in this section means a minimum of four days per week. “Part-time employment” as used in this section, means a maximum of three days a week.

(c) The holder shall be subject to all the provisions of this chapter applicable to licensed dentists with the exception that the special permit shall be renewed annually.