# California RDH Law & Ethics Exam Area 2A: Scope of Practice and Licensure

What Area 2A of the California RDH Law and Ethics exam tests: RDH duties and supervision, professional conduct, renewal and CE rules.

Area 2A · 20% of the California RDH Law & Ethics exam. Last updated 2026-09-24.

Subarea 2A is one of the heaviest-weight blocks on the California RDH Laws and Ethics Written Examination, accounting for 20% of the test. It covers the precise boundaries of what a registered dental hygienist may do and under what level of supervision, the professional conduct standards that govern your license both on and off the clock, and the administrative rules for keeping that license active. Mastering this area is non-negotiable for the exam, as it tests the daily operational realities and legal guardrails of California dental hygiene practice.

## At a glance

| Detail | What the sources establish |
| :--- | :--- |
| **Exam weight** | Subarea 2A makes up 20% of the 2025 outline (the exam has 60 questions, 50 scored, in 90 minutes).[^B1] |
| **Tested tasks** | Scope of practice (T12), professional conduct (T13), and license maintenance (T14).[^B1] |
| **Supervision levels** | California defines only direct and general supervision for hygienists; general supervision is the default for any duty not specifically listed as direct.[^A4] [^A14] |
| **Professional conduct** | Some off-duty conduct can be grounds for discipline. 16 CCR §1135 lists a DUI conviction as substantially related.[^A64] |
| **Continuing education** | No continuing education units are required for a licensee's first renewal period.[^A51] |

## What the exam expects you to know

### T12 — Adhere to scope of practice and professional boundaries

California law gives a registered dental hygienist a specific list of allowed duties and sorts them by supervision level. The state recognizes exactly two supervision levels for hygienists: direct supervision, which means the dentist is physically present in the treatment facility, and general supervision, which means the dentist has given instructions but is not required to be physically present.[^A4] There is no "indirect supervision" in the Dental Hygiene Practice Act. By default, any procedure that does not specifically require direct supervision requires general supervision, provided the situation is not an in-office emergency.[^A14]

You must know the five excluded acts that an RDH may never perform under any level of supervision. These are diagnosis and comprehensive treatment planning; placing, condensing, carving, or removing permanent restorations; surgery or cutting on hard and soft tissue; prescribing medication; and administering anesthesia or sedation, with the specific exceptions of nitrous oxide-oxygen and local anesthesia.[^A8] 

The direct-supervision duties are soft-tissue curettage, local anesthesia, and nitrous oxide-oxygen. To perform these, two conditions must be met simultaneously: the dentist must be physically present in the facility, and the RDH must have previously submitted evidence to the board of completing a DHBC-approved course in these procedures.[^A9] [^A52] 

General-supervision duties include preventive and therapeutic interventions like oral prophylaxis, scaling, and root planing, as well as the application of topical, therapeutic, and subgingival agents, and bleaching-tray duties.[^A10] Additionally, under current law, an RDH may perform two specific duties in a dental office, or in a public health setting using telehealth to communicate with the supervising dentist: determining which radiographs to perform on a patient the dentist has not yet examined (following the dentist's protocols), and placing interim therapeutic restorations (ITRs).[^A11] An ITR is a provisional restoration placed using only hand instrumentation—never rotary—and requires a prior diagnosis, treatment plan, and instruction from a dentist.[^A11]

Finally, some services require no supervision at all. An RDH may provide educational services, oral health training programs, and oral health screenings in any setting, provided they refer any screened patient with a possible oral abnormality to a dentist for a comprehensive examination.[^A12] An RDH may also apply fluoride varnish in any setting without supervision.[^A13] In public health programs created by law or run by a government entity, sponsored events, or nonprofits, an RDH may apply fluorides and pit-and-fissure sealants without supervision.[^A12]

### T13 — Maintain professional conduct and public trust

Your license is governed by a strict code of professional conduct that extends beyond the clinical chair. The board's master list of unprofessional conduct includes obtaining any fee by fraud, fee-splitting or receiving commissions for services, using deceptive advertising, and abandoning a patient without written notice and ample opportunity to secure another provider.[^A37] It also includes clearly excessive treatment, which is a misdemeanor, and the alteration of a patient's record with the intent to deceive.[^A37] You also hold an affirmative reporting duty to the board: you must report in writing within seven days any patient death during a procedure or any unscheduled removal of a patient to a hospital or emergency center for more than 24 hours as a result of treatment.[^A37]

The board's authority also reaches your personal life if your actions are substantially related to the qualifications, functions, or duties of a hygienist. The record of conviction, or a certified copy, is conclusive evidence of the conviction, and a nolo contendere plea counts as a conviction.[^A36] California regulations expressly list convictions for driving under the influence of drugs or alcohol, fiscal dishonesty, and assaultive conduct as substantially related to licensure.[^A64] 

You are also tested on the ethical principles that underpin these laws. The principle of universality dictates that if one individual judges an action to be right or wrong in a given situation, other people considering the same action in the same situation would make the same judgment.[^C2] The principle of non-maleficence requires you to provide services in a manner that protects all clients and minimizes harm. The ADHA code also requires you to refer clients whose needs are beyond the hygienist's ability or scope of practice.[^C2]

### T14 — Comply with license and continuing education requirements

Maintaining a California RDH license requires strict adherence to administrative timelines and continuing education rules. The license operates on a two-year renewal cycle.[^A33] If a license expires, you have a five-year window to renew it by paying all accrued renewal fees plus the delinquency fee; outside of that five-year window, the license may not be renewed, restored, reinstated, or reissued.[^B3] You must also notify the board within 30 days of any change to your physical address of record or email address, and you must provide documentation of a legal name change within 10 days.[^A31] 

For continuing education, the most important rule to remember is the exemption: no continuing education units are required for your first renewal period.[^A51] For your second and all subsequent renewals, an RDH must complete 25 units of continuing education every two years.[^A51] This must include three mandatory courses: two units of California-specific infection control, two units on the California Dental Practice Act, and a Basic Life Support (BLS) certification course.[^A51] The BLS course must include a live, in-person skills practice session; a fully online CPR card will not satisfy the renewal requirement.[^A51] Correspondence and self-study courses are capped at 50% of your total required units. Units must be earned during the preceding two-year period; the rules provide no carry-forward.[^A33] [^A51]

If a licensee faces discipline, the board utilizes formal administrative hearings and may revoke, suspend, reprimand, or place the licensee on probation.[^A35] When deciding a suspension or revocation, the Board considers rehabilitation criteria such as whether the sentence was completed without a parole or probation violation, and any rehabilitation evidence (16 CCR §§1136–1137).[^A64] For licensees dealing with substance abuse, the board offers a confidential diversion program designed to support recovery while protecting the public.[^A38]

## Common traps

*   **The "indirect supervision" trap:** A distractor may offer "indirect supervision" for procedures where the dentist is in the building but not in the room. California defines only direct and general supervision for dental hygienists; indirect supervision is not a valid dental supervision level in the Dental Hygiene Practice Act.[^A4]
*   **The first-renewal CE trap:** A scenario may present a hygienist renewing their license for the first time and ask what CE they are missing. The correct answer is nothing; no CE units are required for the first renewal period.[^A51]
*   **The ITR rotary trap:** A question may suggest that a hygienist can use a slow-speed handpiece to complete an interim therapeutic restoration if the dentist authorizes it. This is a violation; the statute explicitly limits ITRs to hand instrumentation only.[^A11]
*   **The CE rollover trap:** A candidate might assume that completing 30 units of CE means they can carry 5 units into their next renewal cycle. Units must be earned during the preceding two-year period; the rules provide no carry-forward.[^A33]
*   **The off-duty conduct trap:** A distractor may suggest that a weekend DUI cannot affect a license because it did not happen at work. California regulations explicitly list driving under the influence as substantially related to hygiene licensure, making it grounds for board discipline.[^A64]

## Check yourself

Answer the original practice item, then take the free 15-question practice test to see every area.

## How to study this area

Allocate your study time to match this subarea's 20% weight. Because this section is heavily based on statutory definitions and administrative numbers, you must memorize the supervision matrix and the license-cycle timelines. Do not rely on what is common practice in your current office or what you may have learned in another state; the exam tests the exact letter of California law.

When drilling this area, focus on the variables that change a scenario's outcome. Read every scope question to identify the specific duty, the setting, and the physical location of the dentist. 

1.  **Map the supervision levels:** Group duties by their required supervision. Memorize the three direct-supervision duties (soft-tissue curettage, local anesthesia, nitrous oxide-oxygen) and the five excluded acts. Remember that general supervision is the default for everything else.
2.  **Drill the administrative clocks:** Create flashcards for the specific timelines: 2-year renewal, 5-year expiration rescue, 30-day address change, 10-day name change, and the 7-day death or hospitalization report.
3.  **Learn the CE boundaries:** Memorize the 25-unit requirement, the 50% self-study cap, the live-skills requirement for BLS, and the absolute exemption for the first renewal period.
4.  **Connect ethics to law:** When reviewing the ADHA ethical principles, link them to the statutes. Non-maleficence means to provide services in a manner that protects all clients and minimizes harm, and you must refer clients whose needs are beyond the hygienist's ability or scope of practice.

## Questions candidates ask

### Do I need to pass a clinical examination to get licensed in California?
Not necessarily. Under current California law, you can qualify for licensure if, within the preceding three years, you have either passed a board-approved clinical examination or graduated from a California accredited dental hygiene program.[^A17] The California law and ethics written examination, however, is always required.[^A17]

### Can I place an interim therapeutic restoration if the dentist is not in the office?
Yes, provided all statutory conditions are met. ITR placement does not require direct supervision, meaning it falls under general supervision.[^A11] [^A14] However, you may only place the ITR after a dentist has provided a diagnosis, a treatment plan, and instruction to perform the procedure, and you must use hand instrumentation only.[^A11]

### What happens if I forget to renew my license for three years?
You can still renew it without having to reapply as a new candidate. California law provides a five-year window after expiration during which you can renew your license by paying all accrued renewal fees plus the delinquency fee.[^A32] If you wait beyond five years, the license may not be renewed, restored, reinstated, or reissued.[^B3]

[^A4]: Cal. Bus. & Prof. Code § 1902 — Definitions — Article 9 definitions. [Cal. Bus. & Prof. Code § 1902](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1902.&lawCode=BPC)

[^A8]: Cal. Bus. & Prof. Code § 1908 — Practices Included in and Excluded from Dental Hygiene — The practice of dental hygiene (assessment, care-plan development/implementation, education, counseling, screenings) and the excluded acts. [Cal. Bus. & Prof. Code § 1908](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1908.&lawCode=BPC)

[^A9]: Cal. Bus. & Prof. Code § 1909 — Procedures Authorized Under Direct Supervision — Direct-supervision procedures after board-approved coursework. [Cal. Bus. & Prof. Code § 1909](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1909.&lawCode=BPC)

[^A10]: Cal. Bus. & Prof. Code § 1910 — Procedures Authorized Under General Supervision — General-supervision procedures. [Cal. Bus. & Prof. Code § 1910](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1910.&lawCode=BPC)

[^A11]: Cal. Bus. & Prof. Code § 1910.5 — Additional Authorized Duties — Additional duties. [Cal. Bus. & Prof. Code § 1910.5](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1910.5.&lawCode=BPC)

[^A12]: Cal. Bus. & Prof. Code § 1911 — Services Provided Without Supervision — Services without supervision. [Cal. Bus. & Prof. Code § 1911](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1911.&lawCode=BPC)

[^A13]: Cal. Bus. & Prof. Code § 1911.5 — Fluoride Varnish — Fluoride varnish may be provided without supervision, notwithstanding § 1912. [Cal. Bus. & Prof. Code § 1911.5](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1911.5.&lawCode=BPC)

[^A14]: Cal. Bus. & Prof. Code § 1912 — General Supervision Requirement — Default rule. [Cal. Bus. & Prof. Code § 1912](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1912.&lawCode=BPC)

[^A17]: Cal. Bus. & Prof. Code § 1917 — Requirements for Licensure — RDH licensure requirements. [Cal. Bus. & Prof. Code § 1917](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1917.&lawCode=BPC)

[^A31]: Cal. Bus. & Prof. Code § 1934 — Change of Address or Name — Notification duties. [Cal. Bus. & Prof. Code § 1934](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1934.&lawCode=BPC)

[^A32]: Cal. Bus. & Prof. Code § 1936 — Renewal of Expired License — Renewal of an expired license (conditions and fees). [Cal. Bus. & Prof. Code § 1936](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1936.&lawCode=BPC)

[^A33]: Cal. Bus. & Prof. Code § 1936.1 — Continuing Education — Continuing education as a renewal condition. [Cal. Bus. & Prof. Code § 1936.1](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1936.1.&lawCode=BPC)

[^A35]: Cal. Bus. & Prof. Code § 1949 — Consequences of Unprofessional Conduct and the Like — Discipline for unprofessional conduct, incompetence, gross negligence, repeated negligent acts, or license issued by mistake. [Cal. Bus. & Prof. Code § 1949](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1949.&lawCode=BPC)

[^A36]: Cal. Bus. & Prof. Code § 1950 — Consequences of Conviction of a Substantially Related Crime — Discipline upon conviction of a substantially related crime. [Cal. Bus. & Prof. Code § 1950](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1950.&lawCode=BPC)

[^A37]: Cal. Bus. & Prof. Code § 1950.5 — Unprofessional Conduct Defined — Unprofessional conduct defined, subds. (a)–(z). [Cal. Bus. & Prof. Code § 1950.5](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1950.5.&lawCode=BPC)

[^A38]: Cal. Bus. & Prof. Code §§ 1966–1966.6 — Diversion Program. (and following sections; reprinted in the DHBC 2025 Laws and Regulations book) — Impairment rehabilitation and the DHBC diversion program (§§ 1966–1966.6). [Cal. Bus. & Prof. Code §§ 1966–1966.6](https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?sectionNum=1966.&lawCode=BPC)

[^A51]: 16 CCR §§ 1016–1017 — Continuing Education Courses, Providers, and Units. Reprinted in DHBC 2025 Laws and Regulations, pp. 78–83 — Continuing education. [16 CCR §§ 1016–1017](https://www.dhbc.ca.gov/lawsregs/new_dhbc_2025_laws_and_regulations_book.pdf)

[^A52]: 16 CCR § 1107 — RDH Course in Local Anesthesia, Nitrous Oxide-Oxygen Analgesia and Periodontal Soft Tissue Curettage. Reprinted in DHBC 2025 Laws and Regulations, pp. 95–99 — Board-approved RDH course in local anesthesia, nitrous oxide-oxygen analgesia, and periodontal soft-tissue curettage (the § 1909 "SLN" education), with 75% competency thresholds. [16 CCR § 1107](https://www.dhbc.ca.gov/lawsregs/new_dhbc_2025_laws_and_regulations_book.pdf)

[^A64]: 16 CCR §§ 1135–1137 — Substantial Relationship and Rehabilitation Criteria. Reprinted in DHBC 2025 Laws and Regulations, pp. 114–115 — Discipline criteria. [16 CCR §§ 1135–1137](https://www.dhbc.ca.gov/lawsregs/new_dhbc_2025_laws_and_regulations_book.pdf)

[^B1]: PSI Services LLC / DHBC, *Registered Dental Hygienist (RDH) Laws and Ethics Written Examination — Candidate Information Bulletin*, January 2026 edition — RDH exam logistics and blueprint. [PSI Services LLC / DHBC, *Registered Dental Hygienist](https://www.dhbc.ca.gov/formspubs/candidate_handbook.pdf)

[^B3]: Dental Hygiene Board of California, *2025 Dental Hygiene Board of California Laws and Regulations*, revised January 2025 — The first publication on the CIB's list of recommended preparation references (recommended, not the corpus the exam is written from). [Dental Hygiene Board of California, *2025 Dental Hygiene Board of California Laws and Regulations*, revised January 2025](https://www.dhbc.ca.gov/lawsregs/new_dhbc_2025_laws_and_regulations_book.pdf)

[^C2]: American Dental Hygienists' Association, *Code of Ethics* (revised October 2024); on the PSI bulletin's recommended preparation list via adha.org — ADHA Code of Ethics. [American Dental Hygienists' Association, *Code of Ethics*](https://www.adha.org/wp-content/uploads/2025/03/ADHA-Code-of-Ethics_FY24_10_18.pdf)

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