Final answer:
Whether hygienists licensed on or after January 1, 2006 must apply for an RDA license to perform RDA functions depends on state regulations, as licensing requirements differ by state.
Step-by-step explanation:
The information provided appears to regard the licensing requirements for dental hygienists and registered dental assistants (RDAs), which are professions that typically require occupational licenses. It is a well-established fact that occupational licenses are used to ensure quality and reliability in the labor market by indicating that an individual has attained a certain level of education or passed specific tests. Professionals like doctors, teachers, nurses, engineers, accountants, and lawyers, as well as other roles like barbers, embalmers, dietitians, massage therapists, and real estate brokers generally need to secure licenses to work in their professions.
Regarding the original question about whether all hygienists licensed on or after January 1, 2006 must apply for an RDA license separately to perform RDA functions, the answer largely depends on state regulations. This is because the rules for dental professionals, including the requirements for hygienists and RDAs, can vary by state. Each state has its own dental board that sets the regulations and requirements for dental professionals within its jurisdiction.