Cal. Bus. & Prof. Code § 1961

A person who willfully, under circumstances that cause risk of bodily harm, serious physical or mental illness, or death, practices, attempts to practice, advertises, or holds himself or herself out as practicing dental hygiene without having at the time of so doing a valid, unrevoked, and unsuspended license as provided in this article, is guilty of a crime, punishable by imprisonment in a county jail for up to one year. The remedy provided in this section shall not preclude any other remedy provided by law.