How to Pass the California RDH Law and Ethics Exam in 2026

This guide covers one exam: the Registered Dental Hygienist (RDH) Laws and Ethics Written Examination, required by Business and Professions Code section 1917(d) and run by the Dental Hygiene Board of California (DHBC) through its testing vendor, PSI Services LLC. It is a computer-based, closed-book, multiple-choice exam on California dental hygiene law and professional ethics, defined in regulation at 16 CCR §1121.

California runs several exams that all get called "the law and ethics exam," under two different boards, and search results and AI answers mix them together constantly. The confusion runs both ways: the numbers that are true for this exam — 60 questions, 90 minutes, 75% to pass — are flatly false for the dentist exam, and dentist-exam facts (no published question count, no fixed percentage) are false here.

Note the board names carefully. Dentists are licensed by the Dental Board of California (DBC). Hygienists are licensed by the Dental Hygiene Board of California (DHBC) — a separate board within the Department of Consumer Affairs, with its own statutes (the Dental Hygiene Practice Act, BPC §§1900–1966.6), its own regulations (16 CCR Division 11), and its own exam contract with PSI.

Quick check before you spend a dollar on prep: if a study resource for this exam tells you there is no fixed passing score, or quotes dentist-exam fees ($125 + $27.23), it was written for the wrong exam. If a resource for the dentist exam tells you "60 questions, 75%," same problem in the other direction.

Everyone entering California dental hygiene licensure passes this exam. There is no exam-exempt pathway — a point worth stressing because the dentist licensing scheme does have one (licensure by credential), and that fact bleeds into hygiene search results where it is wrong.

The row that surprises people is licensure by credential: an RDH licensed elsewhere skips the clinical exam entirely, but still sits this written exam. California law and ethics is the one thing the board tests everyone on, no matter where you trained or how long you have practiced.

The other statutory requirements ride alongside the exam, not instead of it: the National Board Dental Hygiene Examination is always required (BPC §1917(c)), plus board-approved courses in soft-tissue curettage, local anesthesia, and nitrous oxide (§1917(f)) and — since AB 1257 — a current basic life support (BLS) certification (§1917(g)).

A first sitting costs $232.07: a $200 application fee to the Dental Hygiene Board plus $32.07 to PSI for the exam itself. (Ignore the "$125 application fee" that circulates in AI-generated answers — that figure appears nowhere in the DHBC's own application checklists, which state $200 for both the clinical-exam and credential pathways.)

The sequence, per the DHBC's "How To Qualify for a RDH License" flowchart and the PSI Candidate Information Bulletin:

The clock that matters: one year. The CIB's words: "Your examination eligibility expires and your application is deemed abandoned if you fail to take the RDH written examination within one year after being deemed eligible." Miss the window and you start over — new application, new $200.

Two housekeeping rules from the CIB worth knowing before you pay: cancellations must reach PSI at least 2 days before your appointment, and a no-show or late cancellation forfeits the $32.07 fee.

One fee footnote for 2026: SB 861 (eff. 1/1/2026) restructured the statutory fee caps in BPC §1944. The DHBC's checklists still state $200 as of July 2026; if the board opens a fee rulemaking, the number could change — confirm the current fee on the DHBC applicant page before applying.

The exam is 60 multiple-choice questions in 90 minutes, computer-based, at a PSI test center. Of the 60, 50 are scored and 10 are unscored pretest items — questions PSI is trialing for future forms. (The CIB itself hedges the pretest count as "five to ten" in one place and "10" on its sample-questions page; either way, pretest items do not count toward your score and are not flagged on screen, so answer everything as if it counts.)

What the CIB commits to about the day itself:

• Up to 15 minutes of tutorial time before the exam starts, not counted against your 90 minutes.
• In-person only. PSI administers this exam at roughly 22 California sites plus about 25 out-of-state sites (Albuquerque, Atlanta, the Bronx, Chicago, Dallas, Houston, Nashville, the Philadelphia area, and more). No remote or online proctoring is offered — a relocating or out-of-state candidate books the nearest center, not a webcam session.
• English only. The exam is not offered in other languages (2023 sunset review, p. 12).
• Results on the spot. Your result prints at the test center when you finish and is also transmitted to the DHBC. A pass does not issue your license — see after you pass.

Pace math: 90 minutes for 60 items is 1.5 minutes per question — generous for one-line recall items, tight for scenario items. Flag what you are unsure of and come back; the tutorial time does not eat into it.

The current outline is dated 2025, developed with the Department of Consumer Affairs' Office of Professional Examination Services (OPES) from an occupational analysis of practicing California hygienists. It spans 29 tasks and 61 knowledge statements across three areas (PSI CIB, outline pages):

Study-strategy read: 1A + 2A + 3A alone are 60% of the exam — consent, scope-and-supervision, and duty to the patient. If your time is short, master those three 20% blocks before anything else.

One warning about older materials: the outline changed in 2025. Prep keyed to the previous outline's framing and weights describes an exam that no longer exists — treat any resource that does not reference the 2025 areas above as stale.

The CIB names exactly three references this exam is written from, and the main one is free:

1. The 2025 DHBC Laws and Regulations book — the board's own compilation of the Dental Hygiene Practice Act and 16 CCR Division 11. This is the de-facto official study text, it costs $0, and — said plainly — it can genuinely be enough to pass. The costs are your time (it is raw statute and regulation, not a course) and the absence of practice questions or any signal about what changed recently.
2. The CDHA Code of Ethics (California Dental Hygienists' Association).
3. The ADHA Code of Ethics (American Dental Hygienists' Association).

That is the entire official list. No board-affiliated prep course exists. Third-party question banks and PDF "dumps" circulate; anything sold as actual exam questions is a red flag — obtaining or sharing live exam content is exam subversion under BPC §123, which is printed in the PSI bulletin itself and can cost you the license you are studying for.

How the law maps to the outline. Area 2's 35% lives mostly in one run of statutes — the RDH scope block, BPC §§1907–1915. Learn it as a supervision ladder:

Add the practice definition and its exclusions (§1908 — including that an RDH cannot prescribe), and you have the skeleton the scope questions hang on. Area 1 and Area 3 draw on the consent, privacy, mandated-reporting, and unprofessional-conduct material in the same laws book, plus the two ethics codes.

Most candidates pass: the published pass rates run 80–89% across the four most recent reported years. The only published source is the Legislature's 2023 sunset review of the DHBC (pp. 12–13):

Two honest readings of that table. First, this is a passable exam — four of five candidates clear it, and the free official laws book plus the two ethics codes cover everything it tests. Second, roughly one candidate in six or seven still fails a sitting, and the failure modes are predictable: studying the dentist exam's rules (a different board, different scope statutes, different scoring), studying pre-2024 materials that miss the recent law changes, or underestimating the scenario items in the ethics blocks. Note also the RDHAP column: smaller cohorts and lower, more volatile pass rates (66–82%) — the alternative-practice exam is not the formality its sibling's numbers might suggest.

The board has published nothing newer; the next sunset review is due before January 1, 2028. The exam is offered in English only, which the sunset paper notes explicitly — if English is not your first language, budget the 90 minutes accordingly.

A fail costs $32.07 plus rescheduling time — the mechanics are in the retake section. The rational prep play is not maximum spend; it is making sure what you study is current and written for this exam.

California rewrote a meaningful amount of testable hygiene law in the last two years. If your study source predates these, it will teach answers that are now wrong:

One cross-contamination trap deserves its own paragraph: SB 607's expanded opioid-counseling duty is dentist-exam material, not RDH-exam material. It applies to prescribers, and an RDH cannot prescribe (BPC §1908(b)(4)). Prep that imports dentist prescribing duties — CURES, opioid counseling, controlled-substance rules — into RDH study materials is teaching you the wrong exam.

Dentovio tracks these on a running what-changed hub, and The Dental Pulse sends a short note when a California dental or hygiene law change affects an exam.

Applying in Alternative Practice? The RDHAP Laws and Ethics Written Examination (required by BPC §1922) is a separate exam with its own PSI Candidate Information Bulletin — same 60 items, 90 minutes, 75% minimum, and $32.07 PSI fee, but a different 2025 content outline:

The 2B block is the RDHAP-specific material: written prescriptions, mobile and portable clinics, nontraditional practice settings, and hiring. Behind it sits the RDHAP statute block, BPC §§1922, 1925–1931: authorized settings including residences of the homebound, schools, residential facilities, shortage areas, and dental offices (§1926); the documented-dentist-consultation requirement for curettage and local anesthesia (§1926.01); the 18-month rule and the prescription valid no more than 2 years (§1931); and the required relationship with a dentist (§1930).

Remember the pass-rate table above: RDHAP cohorts are small and rates dipped as low as 66% — proportionally more RDHAP candidates fail than RDH candidates. The 40% alternative-practice area is exactly the material a standard RDH study pass never touches, which is the most plausible reason. Study the RDHAP CIB's own outline, not the RDH one.

A failed sitting is recoverable and cheap by licensing-exam standards. What the primary sources establish:

1. You get a failed score report at the test center, along with an application to retake the examination (CIB, p. 8).
2. PSI charges $32.07 for every registration — the CIB's words: "whether you are taking the examination for the first time or repeating."
3. No waiting period exists in regulation. We read 16 CCR Division 11, Article 6 in full: no section imposes a wait between attempts on the written exam (§1127's appeal rules cover the clinical exam only). Any "90-day wait" you see in search results belongs to the Board of Behavioral Sciences exam.
4. Your 1-year eligibility window keeps running. All attempts must fit inside the year after you are deemed eligible, or the application is abandoned and you restart with a new $200 application.

One honest gap: the DHBC does not publish the mechanics of the retake application itself — whether a board fee attaches or how long processing takes between attempts. Before you plan a quick turnaround, confirm the retake steps with the DHBC directly (dhbc.ca.gov); the only fee the bulletin itself guarantees you will pay again is PSI's $32.07.

Use the gap between attempts on the outline math: the failed score report shows your weaker areas, and the 2025 outline weights tell you what each is worth. A candidate who failed on Area 2 material needs the scope ladder, not another full read of everything.

Passing the exam does not issue your license. The result transmits to the DHBC, and the license issues only after your DOJ and FBI criminal-history clearance comes back. The board's own guidance: if you have passed and have no license after about 30 days, contact the DHBC. (Ignore blog claims that the license goes active "within 24–72 hours of passing" — no primary source supports that.)

Once the number issues, the obligations that keep it alive — all testable Area 2A material, so you may as well retain them:

• Renewal is biennial and costs $300 (raised from $160 on July 1, 2022 — a favorite stale-prep number). The delinquency fee is $150.
• Continuing education: 25 hours every 2 years (BPC §1936.1; 16 CCR §§1016–1017), including the mandatory courses in the Dental Practice Act, infection control, and basic life support.

Both live in the same 2025 laws book you studied from, which is the last honest study tip on this page: the book that gets you through the exam is the same one that governs your first renewal cycle. Keep it.

If you are a DDS/DMD licensure candidate, almost nothing on this page applies to you. Your exam is the California Dental Law and Ethics Examination run by the Dental Board of California — a different board, with no published question count, no fixed 75% rule (its passing score is criterion-referenced, set per test form), different fees, and a two-year eligibility window instead of one.

Read the dedicated guide instead: How to Pass the California Dental Law and Ethics Exam in 2026. And if you arrived here from a study resource that mixed the two exams' numbers, treat that as a signal about the rest of its content.