While employed by or practicing in a primary care clinic or specialty clinic licensed pursuant to Section 1204 of the Health and Safety Code, in a primary care clinic exempt from licensure pursuant to subdivision (c) of Section 1206 of the Health and Safety Code, or a clinic owned and operated by a hospital that maintains the primary contract with a county government to fill the county’s role under Section 17000 of the Welfare and Institutions Code, the following shall apply:

1. (a) A dental assistant, registered dental assistant, or registered dental assistant in extended functions may perform any extraoral duty under the direct supervision of a registered dental hygienist or registered dental hygienist in alternative practice.

2. (b) A registered dental assistant or a registered dental assistant in extended functions may perform the following procedures under the direct supervision of a registered dental hygienist or a registered dental hygienist in alternative practice, pursuant to subdivision (b) of Section 1763:

   1. (1) Coronal polishing.
   2. (2) Application of topical fluoride.
   3. (3) Application of sealants, after providing evidence to the board of having completed a board-approved course in that procedure.