To become a dental hygienist, you complete a dental hygiene program accredited by the Commission on Dental Accreditation (CODA), most often an associate degree (usually about three years, BLS), or a four-year bachelor's degree.
You then pass the National Board Dental Hygiene Examination (NBDHE) and a clinical exam, and meet your state's licensing requirements to earn the Registered Dental Hygienist (RDH) credential.
Unlike dental assisting, you cannot practice without a license; every state requires one.
Together, those are the dental hygienist requirements your state board checks.
Dental hygienist requirements and qualifications
Every state requires dental hygienists to be licensed, and the dental hygienist requirements follow the same pattern in most states: a degree from an accredited dental hygiene program, passing written and clinical exams, and continuing education to keep the license (BLS).
Those are also the qualifications for a dental hygienist on the job market — the RDH license you need before you can treat patients.
The education requirements for dental hygienists come first.
They run through a dental hygiene program accredited by the Commission on Dental Accreditation (CODA), most often at the associate level, though a bachelor's leads to the same license (the degrees are compared below).
One exception to know about: if you graduated from a dental hygiene school outside CODA/CDAC accreditation, you need an Educational Credential Evaluators (ECE) report showing your education is equivalent to a CODA-accredited program before you can sit the NBDHE (JCNDE).
Then the licensing exams: the NBDHE written board, which is intended to fulfill, or partially fulfill, the written-examination requirement for dental hygiene licensure in all states (JCNDE), and a hands-on clinical exam — ADEX, from the American Board of Dental Examiners (formerly CDCA), pairs manikin-based and computer-based simulated testing and is open to students or graduates of CODA-accredited programs.
What varies by state is the fine print: which clinical exam is accepted, whether a jurisprudence (state-law) exam is part of licensure, and the continuing-education rules that come with the license — the state-by-state detail lives in our dental hygienist requirements by state guide.
- A high school diploma or GED
- College-level prerequisite courses, set by each program
- Graduation from a CODA-accredited dental hygiene program
- A passing score on the NBDHE, the national written exam
- A passing clinical exam that your state accepts
- A state RDH license, sometimes with a jurisprudence exam
Licensing requirements vary by state — verify before you enroll
What dental hygienists do and where they work
Before committing to years of school, it helps to know the job.
Dental hygienists work through their own patient schedule: scaling and polishing teeth, periodontal therapy such as scaling and root planing, taking dental x-rays (radiographs), applying sealants and fluoride, screening for oral disease, and coaching patients on home care.
The dentist diagnoses, and the hygienist's findings feed into that exam.
Our dental hygienist career guide covers the role in full.
Most hygienists work in offices of dentists — BLS puts it at 94% — from solo practices to multi-location groups and DSOs.
Periodontal and pediatric offices hire them too, as do community health centers, school sealant programs, and public health departments.
Current openings are listed on our dental hygienist jobs board.
How to become a dental hygienist, step by step
Nearly every RDH gets there through the same seven steps:
Finish high school and the prerequisites
A diploma or GED is the baseline. Programs then set their own college-level prerequisites — sciences and English — so plan on a term or two of coursework before you can apply.Apply to accredited programs
Seats are limited and admission is competitive, so plan to apply to more than one program. The next section covers how to find programs and how applications work.Complete your dental hygiene degree
An associate degree usually takes about three years (BLS); a bachelor's is a four-year course of study. Both combine classroom science with supervised patient care, which is why there's no fully online route to becoming a hygienist.Pass the NBDHE
The national written exam, developed and administered by the Joint Commission on National Dental Examinations (JCNDE), covers the science of dental hygiene. Our guide to the NBDHE, explained breaks down the format, scoring, and retake rules.Pass a clinical exam
A hands-on exam of your patient-care skills, given by testing agencies such as ADEX/CDCA-WREB or CRDTS. Check which exam your target state accepts before you register; our clinical exam guide covers the format and how to prepare.Apply for your state license
Send your exam results and application to the state dental board, which may also require a jurisprudence exam on state dental law. Once the license is issued, you can practice as a Registered Dental Hygienist.Get hired and keep your license current
Apply for hygienist roles, and see new-grad dental hygienist pay for what a first offer realistically looks like. From then on, meet your state's continuing-education and renewal requirements.
Dental hygienist prerequisites and getting into a program
Dental hygienist prerequisites are set by each program.
They are an admissions question, not a licensing one: the school checks them before you start, and the state licenses you after you graduate.
Beyond science and English courses, programs differ on minimum grades, how recently courses must have been taken, and other admission requirements, so read each program's admissions page before you enroll in anything.
Our guide to how long dental hygiene school takes shows how prerequisites fit into the overall timeline.
Finding and applying to programs.
Consider accredited programs only: our dental hygiene programs by state list is drawn from CODA's program directory.
Some programs take applications through the American Dental Education Association's centralized service, ADEA DHCAS, while others use their own application, so check each program's process and deadlines.
Starting as a dental assistant first.
Working as a dental assistant before hygiene school is another way in: it doesn't replace the degree, but it builds chairside experience and shows you the hygienist's job up close.
Our dental hygienist vs. dental assistant comparison lays out how the two careers differ.
What you'll study in dental hygiene school
Dental hygiene school pairs classroom science with patient care.
The coursework tracks what the NBDHE tests: the scientific basis for practice (anatomic sciences, physiology, biochemistry and nutrition, microbiology and immunology, pathology, and pharmacology), the provision of dental hygiene services, and community health and research principles.
Dental radiography and periodontology run through the program as well, since taking x-rays and treating gum disease are central to the job.
Supervised patient care.
Accredited programs pair the classroom science with hands-on clinical instruction: you treat real patients in the school's clinic under faculty supervision, building the scaling, radiography, and patient-care skills the licensing exams test.
Some programs add rotations at community clinics or other off-campus sites, so ask each program how its patient-care hours are structured.
Associate, bachelor's, or master's degree?
To start practicing, an associate degree is the entry-level education BLS lists for hygienists, and it is sufficient for licensure.
A bachelor's or master's leads to the same RDH license and the same chairside work; the extra education matters for roles beyond the operatory.
| Degree | Typical length | What it's for |
|---|---|---|
| Associate (often an Associate of Applied Science, AAS) | About 3 years | The entry-level education BLS lists; sufficient for the RDH license |
| Bachelor's degree in dental hygiene | About 4 years | The same license, plus a path into teaching, public health, and research |
| Degree completion (associate to bachelor's) | Varies by program | Licensed hygienists adding a bachelor's while they work |
| Master's degree in dental hygiene | After a bachelor's | Education, research, and leading a hygiene program |
Cost varies widely by school and state — compare total program cost, not just tuition, when you choose between routes.
For the full trade-off, see associate vs. bachelor's in dental hygiene.
If teaching appeals to you, note that CODA requires a hygiene program's administrator to be a dental hygienist or dentist who graduated from a CODA-accredited program and holds a master's degree or higher; our guide to becoming a dental hygiene educator covers the faculty requirements.
The licensing exams and your state license
Licensure rests on two examinations plus your state's own requirements.
The NBDHE covers the science of dental hygiene; a separate clinical exam tests hands-on skills, and states differ on which testing agency's exam they accept.
Jurisprudence exam.
A state may also add a jurisprudence exam on the state's dental practice act and rules — the laws that set what a hygienist may do and under what supervision.
Whether one is required, and its format, depend on the state.
Continuing education and license renewal.
A dental hygiene license is renewed on the state's schedule, and each state sets its own continuing-education requirements for renewal.
Hours, required topics, and cycle length vary, so start with our dental hygienist requirements by state and confirm the current rules with your state.
One development to watch: the Dentist and Dental Hygienist (DDH) Compact, an interstate agreement meant to ease practicing across state lines, which is still being implemented.
Verify with your state dental board
Dental hygienist salary and job outlook
The national median wage for dental hygienists is $98,100 a year, or $47.16 an hour (BLS OEWS, SOC 29-1292, May 2025).
The lowest-paid 10% earn less than $74,880 and the highest-paid 10% more than $126,050 (BLS).
Pay varies with state, metro, and schedule.
Our dental hygienist salary guide breaks it down, and new-grad pay covers the starting range.
BLS projects employment of dental hygienists to grow 8% from 2025 to 2035, from 225,300 to 243,200 jobs — compared with 3.5% projected for all occupations — with about 15,000 openings a year (BLS Employment Projections, 2025–35).
Practices feel that demand already: in an April 2026 ADA Health Policy Institute report, only 60% of dentists said they had an adequate number of dental hygienists on staff.
After you're licensed: expanding your scope
A new license is a starting point.
Hygienists can add duties after additional training — local anesthesia and nitrous oxide, for example.
The requirements around each are set state by state: which courses count, whether a separate permit is needed, and under what supervision.
Check your state's requirements and our guide to local anesthesia course hours before you sign up for a course.
Other paths build on more education or experience: direct-access care where states allow it, dental therapy in states that license therapists, and teaching or public health with a bachelor's or master's.
Temp and per-diem work also lets hygienists fill shifts across several offices.
Where to check the official rules
These organizations set or publish the rules this guide summarizes:
- Your state dental board: licensing, jurisprudence exams, scope of practice, and renewal
- Commission on Dental Accreditation (CODA): accredits dental hygiene programs and publishes the program directory
- Joint Commission on National Dental Examinations (JCNDE): develops and administers the NBDHE
- American Dental Education Association (ADEA): runs the DHCAS centralized application
- American Dental Hygienists' Association (ADHA): the national professional association for dental hygienists
This article is general information, not legal or medical advice. Dental hygiene education, exam, and licensing requirements vary by state and change over time — confirm current requirements with your state dental board.