How to Become a Registered Dental Assistant in 2026 (Quick Answer)
A Registered Dental Assistant (RDA) is a state credential — not a national one — and California's RDA, issued by the Dental Board of California (DBC), is the largest and most-searched. To become a California RDA in 2026 you must: (1) qualify through one of seven eligibility pathways under SB 1453 (effective July 1, 2025), (2) complete the required Board-approved courses (radiation safety, coronal polishing, pit and fissure sealants, infection control, the California Dental Practice Act, and CPR/Basic Life Support), (3) apply to the DBC with the $120 application fee, and (4) pass the RDA Combined Written General and Law and Ethics Examination at a PSI test center.
Two things changed recently and most pages have not caught up: SB 1453 rewrote the eligibility pathways on July 1, 2025, and the written exam was restructured on November 1, 2025 to 100 scored items (down from 125) plus 25 unscored pretest items. There is no longer a practical/clinical exam — California discontinued it in 2017. This guide walks the full 2026 path, then gives you a study plan and a free RDA question bank.
RDA vs. RDH vs. CDA: Know Which Credential You Want
These three get confused constantly, and choosing the wrong study path wastes months. They are distinct roles with different exams and different scopes of practice.
| Credential | What it is | Who issues it | Typical training |
|---|---|---|---|
| RDA — Registered Dental Assistant | A state-licensed dental assistant authorized to perform expanded basic supportive duties (coronal polishing, sealants, taking impressions, applying topical agents) | Your state dental board (e.g., the Dental Board of California) | Approved program or work experience + courses |
| RDH — Registered Dental Hygienist | A licensed clinician who performs scaling, root planing, and periodontal assessment | State dental board + national boards | Accredited 2-4 year hygiene degree |
| CDA — Certified Dental Assistant (DANB) | A national certification from the Dental Assisting National Board, not a state license | DANB | Passing DANB component exams (RHS, ICE, GC) |
The Seven California RDA Eligibility Pathways (SB 1453, Effective July 1, 2025)
Senate Bill 1453 replaced California's older, narrower eligibility rules with seven pathways. You only need to satisfy one. Every pathway still requires the Board-approved courses (next section) and passing the written exam.
| # | Pathway | Core requirement |
|---|---|---|
| 1 | Board-approved RDA educational program | Graduate from a DBC-approved RDA program (the most common route; programs build in the required courses) |
| 2 | Work experience | At least 15 months and a minimum of 1,280 hours of work experience as a dental assistant, plus the required courses |
| 3 | Non-Board-approved program + work experience | Combined dental-assisting education and on-the-job experience totaling at least 15 months and 1,280 hours |
| 4 | DANB Certified Dental Assistant (CDA) | Hold a current, active DANB CDA certification (the new CDA pathway), plus the required courses |
| 5 | Alternative dental assisting program | Complete at least 500 hours of didactic and laboratory coursework plus at least 300 hours of clinical chairside work experience |
| 6 | Preceptorship in dental assisting | Complete at least 500 hours of clinical chairside work experience plus at least 300 hours of approved coursework |
| 7 | Registered Dental Hygienist | Hold a current, active California RDH license issued on or after January 1, 2006 |
SB 1453 also added a rule that matters even before you qualify for the RDA: unlicensed dental assistants must complete a Board-approved 8-hour infection control course before performing any basic supportive procedure that risks exposure to blood or saliva. So the infection control course is doing double duty — it is both an employment prerequisite and an RDA requirement.
Pathway tip: Pathways 2 and 3 (work experience) are how many practicing chairside assistants convert to a license without going back to school full-time. Track your hours carefully — the DBC counts 15 months and 1,280 hours, so you need both, not either.
Required Board-Approved Courses
Regardless of which pathway you use (program graduates usually get these embedded in their curriculum), California requires the following Board-approved courses before licensure. Note the renewal windows — some expire and must be current at the time you apply.
| Course | Hours | Validity |
|---|---|---|
| Radiation Safety | 32 hours | 10 years |
| Coronal Polishing | 12 hours | 5 years |
| Pit and Fissure Sealants | 16 hours | 5 years |
| Infection Control | 8 hours | 2 years |
| California Dental Practice Act | 2 hours | 2 years |
| Basic Life Support (CPR) | Current certification | Per provider |
Because the Dental Practice Act and Infection Control courses are only valid for 2 years, do not complete them too early — if they lapse before your application is approved, you will have to retake them.
The RDA Written Exam in 2026: What the November 2025 Restructure Changed
The RDA is now a written-only examination. California suspended the RDA practical (clinical) exam in 2015 and permanently discontinued it in 2017 after the Office of Professional Examination Services (OPES) found reliability problems. So if a page still tells you to prepare for a hands-on RDA clinical exam, it is out of date.
The current test is the RDA Combined Written General and Law and Ethics Examination, administered by PSI (Psychological Services, Inc.) at computer-based test centers. As of the November 1, 2025 restructure:
| Feature | Detail |
|---|---|
| Total items | 125 (100 scored + 25 unscored pretest) |
| Scored items | 100 (reduced from 125 under the November 2023 regulation) |
| Time limit | 3 hours |
| Format | Computer-based, multiple choice, at a PSI test center |
| Scoring | Criterion-referenced passing standard — the cut score reflects the knowledge required for competent practice, not a fixed percentage |
| Results | Pass/fail only, delivered at the PSI test center after you finish; the DBC does not release the numeric score |
OPES recommended two linked changes: moving from a fixed minimum passing score to a criterion-referenced cut score, and cutting scored items from 125 to 100. The stated goal was to lower barriers to licensure while keeping the exam reliable. The content still spans the DBC's general RDA outline domains — chairside/clinical support, dental materials, radiation safety, infection control, and the California Dental Practice Act (law and ethics).
What the exam covers
While the DBC does not publish a fixed per-domain item count, the blueprint reflects the duties an RDA is licensed to perform. Expect questions across:
- Infection control and safety — sterilization, PPE, the 8-hour course content, OSHA-style hazard handling
- Radiation safety — exposure principles, ALARA, film/sensor placement, dose limits
- Dental materials — impression materials, cements, restorative materials, mixing and handling
- Chairside and clinical support — instrument transfer, isolation, coronal polishing, pit and fissure sealants, impressions
- Law and ethics — the California Dental Practice Act: scope of practice, supervision levels, recordkeeping, patient rights, and licensing rules
The law and ethics content is where out-of-state assistants most often slip, because it is California-specific. Do not assume your DANB or other-state knowledge covers it.
What It Costs to Become a California RDA in 2026
The credential itself is inexpensive compared with the courses behind it. Here is the fee picture.
| Cost | Amount | Paid to |
|---|---|---|
| RDA application fee | $120 (nonrefundable) | Dental Board of California |
| Written exam registration | $46.59 | PSI (Psychological Services, Inc.) |
| Live Scan fingerprinting | ~$50-$80 (rolling + DOJ/FBI fees vary by site) | Live Scan provider |
| Required courses | Varies widely by provider | Course providers |
| Initial license issuance | No additional fee beyond the application | Dental Board of California |
The biggest variable is the required courses. If your pathway is a Board-approved RDA program, those courses are usually bundled into tuition. If you are qualifying by work experience, you will buy the radiation safety, coronal polishing, sealants, infection control, Dental Practice Act, and CPR courses separately. Always confirm the live fee in your application portal and PSI cart — those figures govern.
How to Apply: Step by Step
- Confirm your pathway. Pick which of the seven SB 1453 pathways you qualify under and gather the documentation (program diploma/transcript, or work-experience verification with dates and hours).
- Complete the required courses. Finish radiation safety, coronal polishing, pit and fissure sealants, the 8-hour infection control course, the California Dental Practice Act course, and current CPR — and make sure the 2-year courses are still valid.
- Create a BreEZe account (or use the paper application) and submit your RDA application with course certificates and pathway proof.
- Pay the $120 application fee (nonrefundable).
- Complete Live Scan fingerprinting for the criminal background check.
- Get Board approval to test, then register and pay PSI ($46.59) and schedule your written exam.
- Pass the RDA Combined Written General and Law and Ethics Examination at a PSI center. Results are pass/fail, given on the spot.
- Receive your RDA license. You can then practice the expanded duties an RDA is authorized to perform.
Official source for the current pathways, courses, and exam: the Dental Board of California — Become a Licensed RDA page.
A Realistic 6-Week RDA Study Plan
Most candidates who qualify by program already know the clinical content; the exam trips people up on breadth (one form touches every domain) and on the California-specific law and ethics. This plan assumes you study alongside work and aims at the restructured 100-scored-item exam.
| Week | Focus | Daily goal |
|---|---|---|
| 1 | Infection control + safety (the 8-hour course content, sterilization, PPE) | 20-30 practice questions/day; re-read your infection control materials |
| 2 | Radiation safety (ALARA, exposure, dose limits, sensor placement) | 20-30 questions/day; flag every missed item for review |
| 3 | Dental materials (impressions, cements, restoratives, mixing) | 30 questions/day; build a one-page materials cheat sheet |
| 4 | Chairside/clinical support (instrument transfer, isolation, coronal polish, sealants, impressions) | 30 questions/day; rehearse procedure sequences |
| 5 | California Dental Practice Act — law & ethics (scope, supervision, records, patient rights) | 30 questions/day; this is the most California-specific block — over-study it |
| 6 | Full-breadth mixed review + timed practice | 2-3 timed mock exams; review every wrong answer with the AI tutor |
Because the passing standard is criterion-referenced, you cannot reverse-engineer a fixed percentage to coast to. Aim for consistent accuracy across every domain rather than mastering favorites and ignoring weak spots — a lopsided score can still fall under the competency cut.
Common Mistakes That Delay RDA Licensure
- Confusing the RDA with the DANB CDA. The CDA is a national certification and one pathway to the California RDA — it is not the license. You still apply to the DBC and pass the state exam.
- Preparing for a practical exam that no longer exists. California discontinued the RDA clinical/practical exam in 2017. The current credential is written-only.
- Letting short-validity courses expire. The Dental Practice Act and infection control courses are valid for only 2 years. Complete them close to your application, not years ahead.
- Under-studying law and ethics. Out-of-state and DANB-trained candidates often assume their general knowledge covers California rules. The Dental Practice Act content is California-specific and heavily tested.
- Missing the 'and' in the work-experience pathway. Pathways 2 and 3 require 15 months and 1,280 hours — both conditions, not whichever you hit first.
- Studying only your strong domains. With a criterion-referenced cut and a one-form-touches-everything blueprint, neglecting one domain (often radiation safety or materials) can sink an otherwise strong attempt.
- Skipping the 8-hour infection control course before working. Under SB 1453, unlicensed assistants must complete it before performing exposure-prone basic supportive procedures — independent of the RDA timeline.
Free RDA Exam Prep on OpenExamPrep
The credential is cheap; the studying is where you win or lose your first attempt. OpenExamPrep offers a 100% free RDA prep path:
- Free RDA Practice Questions — multiple-choice items across infection control, radiation safety, dental materials, chairside support, and the California Dental Practice Act
- Free RDA Study Guide — domain-by-domain coverage aligned to the DBC outline
- AI tutor — ask why an answer is wrong, request a study plan, or have a tricky law-and-ethics rule explained in plain language
- Timed mock exams that mirror the 3-hour, multiple-choice format
No paywall, no credit card. Start where you are weakest and let the practice data tell you when you are ready.
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