Cal. Bus. & Prof. Code § 1751

At least once every seven years, the board shall review the allowable duties for dental assistants, registered dental assistants, registered dental assistants in extended functions, dental sedation assistant permitholders, and orthodontic assistant permitholders, the supervision level for these categories, and the settings under which these duties may be performed, and shall update the regulations as necessary to keep them current with the state of the dental practice.