What Are RDA and RDH
RDA stands for Registered Dental Assistant, while RDH stands for Registered Dental Hygienist. Both work in dental offices but have different scopes of practice, education requirements, and earning potential. The RDA role focuses on chairside support, infection control, and patient preparation, whereas the RDH role emphasizes preventive care, periodontal therapy, and patient education. Understanding the distinction between RDA vs RDH is essential for anyone exploring dental healthcare careers.
In the United States, dental auxiliaries operate under state-specific regulations. The American Dental Association and state boards define permitted functions for each role. RDAs typically require completion of an accredited dental assisting program or on-the-job training, while RDHs must complete an accredited dental hygiene program and pass national and state licensing exams. The path to becoming an RDH generally takes two to four years of postsecondary education.
Education and Licensing Requirements
To become an RDA, candidates usually complete a one-year certificate or diploma program, though some states allow entry through work experience. Programs cover anatomy, infection control, radiography, and chairside assisting. Many states require RDAs to pass a written and clinical exam, such as the Dental Assisting National Board (DANB) certification. In contrast, RDHs must earn an associate or bachelor's degree in dental hygiene from an accredited institution and pass the National Board Dental Hygiene Examination and a state clinical board.
The Commission on Dental Accreditation (CODA) accredits dental hygiene and dental assisting programs across the country. As of 2024, over 300 CODA-accredited dental hygiene programs and more than 250 dental assisting programs are available in the U.S. The American Dental Education Association tracks enrollment trends, showing steady growth in both fields. For more details on accredited programs, see the CODA overview at ada.org.
Salaries and Job Outlook
Salaries for RDA vs RDH differ significantly due to education and scope of practice. The U.S. Bureau of Labor Statistics reports that dental hygienists earned a median annual wage of approximately $81,400 in 2023, while dental assistants earned a median wage near $46,540 in the same period. Top-paying states for RDHs include California, Washington, and Nevada, where salaries can exceed $120,000. For RDAs, states like Minnesota, Alaska, and New Hampshire offer higher-than-average pay.
Job demand for both roles remains strong. The BLS projects dental hygienist employment to grow by about 9 percent from 2023 to 2033, faster than the average for all occupations. Dental assistant employment is projected to grow around 7 percent over the same period. Factors driving demand include an aging population, increased recognition of oral health's link to overall health, and expanded duties for dental auxiliaries. For current labor statistics, visit the BLS Occupational Outlook Handbook at bls.gov.