Cal. Bus. & Prof. Code § 1932
(a) The dental hygiene board may, in its sole discretion, issue a probationary license to an applicant who has satisfied all requirements for licensure as a registered dental hygienist, a registered dental hygienist in alternative practice, or a registered dental hygienist in extended functions. The dental hygiene board may require, as a term or condition of issuing the probationary license, that the applicant comply with certain additional requirements, including, but not limited to, the following: