California Code, Business and Professions Code - BPC § 1640.2

(a) The board shall limit the number of special permits to practice in a discipline at a college to the number that may be properly administered and supervised by the board.

(b) The board shall allow a person who has held a special permit for at least the seven preceding years to enter into a part-time contract with a California dental college approved by the board, provided that the person notifies the board of this change and provides the board with a pending employment contract for part-time employment with a California dental college approved by the board.

(c) A holder of a special permit shall practice no more than one day per week in the school's faculty practice.