Dental Hygienist Requirements in New Hampshire: Scope of Practice & Direct Access
Dental Hygienists in New Hampshire are regulated by the New Hampshire Board of Dental Examiners. The ADHA records 2 direct-access provisions for New Hampshire — Supervision (Rule 302.02(d), 402.01(d) Public Health); Certified Public Health Dental Hygienist (Sec. 317-A:21-e) — the rules that decide whether a dental hygienist there can work without a dentist on site; see below for what they cover.
Verify before you rely on this
At a glance
ADHA Direct Access chart
Direct access
Yes
Differ in scope — see below
Provisions
2
ADHA Practice Act chart
Permitted functions
12 of 22
Verified September 2026
Regulated by
New Hampshire Board of Dental Examiners
New Hampshire’s Direct-Access Provisions (2)
Supervision
Dental hygienist may treat patients in a school, hospital, institution or residence of a homebound patient.
Supervising dentist must authorize dental hygienist to provide services but need not be present for care.
Provider services: Dental hygienist can provide instruction in oral hygiene, topical fluorides, prophylaxis, assess medical/dental history, periodontal probing/charting, and sealants.
Requirements: None.
Certified Public Health Dental Hygienist
Dental hygienist may practice in a school, hospital, or other institution, or for a homebound person without the dentist having to be present, provided the dentist has reviewed the records once in a 12-month period.
Dental Hygienists may perform any procedure that is within the scope of practice that has been authorized under public health supervision.
Provider services: Dental hygienist can perform radiographic imaging limited to bite wings, and occlusal and periapical radiography and provide nutritional counseling for the control of dental disease.
Requirements: Any dental hygienist shall be considered qualified as a certified public health dental hygienist after obtaining a bachelor's degree in dental hygiene with a minimum of 6 semester hours in community dental health; obtaining a master's degree in public health; or after successfully completing specified courses and successful completion of an examination by the course provider.
What a Dental Hygienist Can Do in New Hampshire: Permitted Functions & Supervision Levels
Of the 12 functions listed for New Hampshire on the ADHA chart, most sit at general supervision, where a dentist authorizes the service in advance but does not need to be present.
Oral prophylaxis, topical anesthesia, pit/fissure sealants, scaling and root planing, soft tissue curettage, removing periodontal dressings, and removing sutures all sit at general supervision alone.
X-rays and fluoride add a two-level G/CP cell, general supervision in one setting and collaborative practice in the other.
Local anesthesia, administering nitrous oxide, and placing periodontal dressings are listed at direct supervision, where the dentist must be present.
Ten functions, including dental hygiene diagnosis, dental hygiene assessment, treatment planning, prescriptive authority, Botox, lasers, vaccines and dermal fillers, are not listed on the chart for New Hampshire — the largest single group of the 22.
- Local anesthesia is listed at direct supervision (D) for New Hampshire, meaning the dentist must be present — a stricter level than the general supervision most other listed functions carry.
- Administering nitrous oxide and placing periodontal dressings are also listed at direct supervision (D), the same stricter level as local anesthesia.
- X-rays and fluoride each carry a two-level G/CP cell for New Hampshire: general supervision in one setting and collaborative practice, meaning a hygienist may practice without supervision under a collaborative agreement with a dentist, in the other.
- Ten of the 22 functions, including dental hygiene diagnosis, dental hygiene assessment, treatment planning and prescriptive authority, carry no supervision level for New Hampshire on the chart, which ADHA records as not listed rather than banned.
- G
- General supervision: dentist needs to authorize prior to services, but need not be present
- CP
- Collaborative practice: RDH may practice without supervision, pursuant to a collaborative agreement between the RDH and a licensed dentist
- D
- Direct supervision: dentist needs to be present
Read the chart the way ADHA means it
Source: ADHA Dental Hygiene Practice Act Overview: Permitted Functions and Supervision Levels by State (8.24.26 update). This document is intended for informational purposes only and does not constitute a legal opinion regarding dental practice in any state. To verify any information, please contact your state's dental board.
Local Anesthesia by Dental Hygienists in New Hampshire
New Hampshire authorized hygienists to administer local anesthesia in 2002 by statute.
The ADHA Local Anesthesia chart lists direct supervision, meaning the dentist must be present, for both block and infiltration injections.
Education is from an accredited program, and the chart lists the NERB local anesthesia exam.
The course requirement it records is 20 hours didactic and 12 hours clinical.
Confirm current course, exam, and permit rules with the New Hampshire Board of Dental Examiners before enrolling or applying.
- State & Year Implemented
- 2002
- Supervision Required
- Direct
- Block and/or Infiltration
- Both
- Education Required
- Accredited
- Exam Required
- Yes – NERB local anesthesia exam
- Authorized by Statute or Rule
- Statute
- Legal Requirements for Local Anesthesia Courses
- 20 hrs didactic; 12 hrs clinical
Source: ADHA Local Anesthesia Administration by Dental Hygienists – State Chart (Revised December 2025). This document is intended for informational purposes only and does not constitute a legal opinion regarding dental practice in any state. To verify any information, please contact your state's dental board.
Silver Diamine Fluoride by Dental Hygienists in New Hampshire
New Hampshire's ADHA silver diamine fluoride entry names SDF directly rather than folding it under a general fluoride provision.
It cites Den 402.01(a)(15), which lists dental hygienists among those who may apply topical preventive and anesthetic agents, including silver diamine fluoride.
ADHA's supervision line for New Hampshire is General.
The entry does not itself describe what that requires procedurally, such as whether a dentist must be present or only needs to authorize the service in advance.
Its reference is New Hampshire Board of Dental Examiners meeting minutes dated March 7, 2016, rather than a separate rule or statute.
It attaches no training, course, setting, or permit condition to SDF application.
Dental hygienists may apply topical preventive and anesthetic agents, including silver diamine fluoride.
Source: ADHA State Specific Information on Silver Diamine Fluoride (Revised September 2025). This document is intended for informational purposes only and does not constitute a legal opinion regarding dental practice in any state. To verify any information, please contact your state's dental board.
What Direct Access Does — and Doesn’t — Cover
Direct access is one dimension of scope, not scope itself. The ADHA’s direct-access chart records whether a dental hygienist can initiate treatment and treat a patient without a dentist present — the function-by-function supervision levels and the local anesthesia rules above come from two separate ADHA charts, and the three do not always line up neatly.
Don’t generalize from a direct-access provision to any other part of scope, and confirm specifics with the New Hampshire Board of Dental Examiners.
Frequently Asked Questions
Does a dentist have to supervise a dental hygienist in New Hampshire?
It depends on which provision applies.
Under the 1993 Supervision provision (Rule 302.02(d), 402.01(d) Public Health), a hygienist may treat patients in a school, hospital, institution, or a homebound patient's residence without the dentist present, but the supervising dentist must still authorize the services.
Under the 2012 Certified Public Health Dental Hygienist provision (Sec. 317-A:21-e), a hygienist may practice in similar settings without the dentist present, but only after obtaining the certified public health dental hygienist credential — a qualifying bachelor's or master's degree, or specified coursework plus an exam — and the dentist must still review records once every 12 months.
Neither is an unconditional "no supervision needed." Confirm current details with the New Hampshire Board of Dental Examiners.
Who regulates dental hygienists in New Hampshire?
Dental Hygienists in New Hampshire are regulated by the New Hampshire Board of Dental Examiners.
Scope of practice is set by state law and changes over time, so verify current rules directly with the board before relying on them.
Can a dental hygienist in New Hampshire give local anesthesia without a dentist present?
No. The ADHA Practice Act chart lists local anesthesia at direct supervision for New Hampshire, meaning the dentist must be present while it is administered.
The Local Anesthesia chart agrees, listing direct supervision since 2002 for both block and infiltration injections, with education from an accredited program and the NERB local anesthesia exam.
That is a stricter level than most other New Hampshire hygiene functions, which sit at general supervision.
Confirm current requirements with the New Hampshire Board of Dental Examiners.
Which New Hampshire hygiene functions require the dentist to be in the room?
Three functions on the ADHA chart carry direct supervision for New Hampshire: local anesthesia, administering nitrous oxide, and placing periodontal dressings.
Direct supervision means the dentist must be present.
Everything else that is listed sits at general supervision, or at a two-level general supervision/collaborative practice cell for x-rays and fluoride.
The chart does not say which cells carry ADHA's numbered footnotes, so check the New Hampshire Board of Dental Examiners' rules for any condition attached to these functions.
Does the New Hampshire chart list dental hygiene diagnosis or prescriptive authority?
No. Dental hygiene diagnosis, dental hygiene assessment, treatment planning, and prescriptive authority are not listed on the ADHA Practice Act chart for New Hampshire.
Not listed means the chart records no supervision level for that function in this state, which ADHA notes is a narrower statement than a ban.
If you have questions about whether hygienists in New Hampshire perform any of these functions in practice, ask the New Hampshire Board of Dental Examiners directly.
Does the chart say whether a New Hampshire hygienist can give Botox or vaccines?
No. Botox and vaccines are both listed as not on the chart for New Hampshire, along with lasers, dermal fillers, placing sutures, and study cast impressions.
Not listed means ADHA's chart records no supervision level for that function in this state — it is not the same as a statement that the function is banned.
For a current answer about whether a New Hampshire hygienist may perform any of these, contact the New Hampshire Board of Dental Examiners.
Does New Hampshire's silver diamine fluoride entry say whether a dentist must be present?
Not directly.
ADHA lists New Hampshire's supervision level for silver diamine fluoride as General, but the entry itself does not define what General requires procedurally, such as whether the dentist must be present or only needs to authorize the service in advance.
The entry cites Den 402.01(a)(15), which names silver diamine fluoride among the topical preventive and anesthetic agents hygienists may apply, and references New Hampshire Board of Dental Examiners meeting minutes dated March 7, 2016.
Ask the New Hampshire Board of Dental Examiners what General supervision requires in practice.
Does New Hampshire's rule name silver diamine fluoride, or is it covered under general fluoride language?
Yes.
New Hampshire's entry names silver diamine fluoride directly rather than leaving it to be inferred from a broader fluoride term.
The cited rule, Den 402.01(a)(15), lists dental hygienists among those who may apply topical preventive and anesthetic agents, including silver diamine fluoride.
The entry states no separate training, course, or permit condition beyond the General supervision level, and cites board meeting minutes rather than a statute.
Confirm current rules with the New Hampshire Board of Dental Examiners.
More New Hampshire & Dental Hygienist Resources
Sourced from the ADHA Direct Access States chart (Revised February 2025), the ADHA Dental Hygiene Practice Act Overview: Permitted Functions and Supervision Levels by State (8.24.26 update) and the ADHA Local Anesthesia Administration by Dental Hygienists – State Chart (Revised December 2025), and the ADHA State Specific Information on Silver Diamine Fluoride (Revised September 2025). Verified September 2026. This page is general information, not legal advice — confirm current rules with the New Hampshire Board of Dental Examiners.