Dental Hygienist Requirements in Colorado: Scope of Practice & Direct Access
Dental Hygienists in Colorado are regulated by the Colorado Dental Board. The ADHA records a direct-access provision for Colorado — Unsupervised Practice (Sec. 12-35-124) — the rule that decides whether a dental hygienist there can work without a dentist on site; see below for what it covers.
Verify before you rely on this
At a glance
ADHA Direct Access chart
Direct access
Yes
Since 1987
Category
Unsupervised Practice
Colorado law
Statute
Sec. 12-35-124
ADHA Practice Act chart
Permitted functions
18 of 22
Verified September 2026
Regulated by
Colorado Dental Board
Colorado’s Direct-Access Provision: Unsupervised Practice
There is no requirement that a dentist must authorize or supervise most dental hygiene services.
Dental hygienist may also own a dental hygiene practice.
Provider services: Dental hygienist can provide dental hygiene diagnosis, radiographs, remove deposits, accretions and stains, curettage without anesthesia, apply fluorides and other recognized preventive agents, topical anesthetic, oral inspection and charting. Local anesthesia requires general supervision.
Requirements: None.
What a Dental Hygienist Can Do in Colorado: Permitted Functions & Supervision Levels
Colorado sits at the direct-access end of the ADHA chart for most of what a hygienist does day to day.
Oral prophylaxis, x-rays, topical anesthesia, fluoride, sealants, scaling and root planing, soft tissue curettage, study cast impressions, dental hygiene diagnosis, assessment and treatment planning, and prescriptive authority are all listed at direct access, meaning the hygienist provides them as they determine appropriate without specific authorization.
The exceptions are specific: local anesthesia and placing or removing periodontal dressings and removing sutures sit at general supervision, where a dentist authorizes in advance but need not be present, and administering nitrous oxide and using lasers require direct supervision with the dentist present.
Placing sutures, Botox, vaccines and dermal fillers are not listed on the chart for Colorado.
- Twelve of the 22 functions, including dental hygiene diagnosis and prescriptive authority, are listed at direct access (A) for Colorado.
- Local anesthesia is listed at general supervision (G), not direct access, so a dentist must authorize it in advance even though most other services need no authorization.
- Administering nitrous oxide and using lasers are the two functions listed at direct supervision (D), which means the dentist needs to be present.
- Placing sutures, Botox, vaccines and dermal fillers carry no supervision level for Colorado on the chart, which ADHA records as not listed, a narrower statement than a ban.
- A
- Direct access: hygienists can provide services as s/he determines appropriate without specific authorization
- G
- General supervision: dentist needs to authorize prior to services, but need not be present
- 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 Colorado
Colorado authorized hygienists to administer local anesthesia in 1977 by statute.
The ADHA chart lists general supervision, both block and infiltration injections, education from an accredited program, and no separate exam requirement.
The course requirement it records is 12 hours didactic and 12 hours clinical.
Confirm the current course and permit rules with the Colorado Dental Board before enrolling or applying.
- State & Year Implemented
- 1977
- Supervision Required
- General
- Block and/or Infiltration
- Both
- Education Required
- Accredited
- Exam Required
- No
- Authorized by Statute or Rule
- Statute
- Legal Requirements for Local Anesthesia Courses
- 12 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 Colorado
ADHA's silver diamine fluoride document names SDF directly for Colorado rather than folding it under fluoride.
The entry cites 3 CCR 709-1.26 and lists supervision as direct, indirect, or telehealth.
The quoted rule attaches two conditions: the hygienist must first complete a post-secondary course or continuing education as the rule describes, and the application happens in a dental office setting under one of those three supervision types.
Where telehealth supervision is used, the supervising dentist must have a physical practice location in Colorado for patient referral and follow-up care.
Pursuant to sections 12-35-125(1)(j) and 12-35-128.8, C.R.S., upon completion of a post-secondary course or continuing education as stated in B (2) and (3), a dental hygienist may place/apply silver diamine fluoride in a dental office setting under the “direct supervision” (defined by section 12-35- 103(6), C.R.S.) or “indirect supervision” (defined by section 12-35-103(10), C.R.S.) of a dentist, or through “telehealth supervision” (defined by section 12-35-103(17), C.R.S.) for purposes of communication with the supervising dentist. A dentist who supervises a dental hygienist that applies silver diamine fluoride under telehealth supervision must have a physical practice location in Colorado for purposes of patient referral for follow-up care.
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 Colorado Dental Board.
Can a Colorado Dental Hygienist Own a Practice?
Yes. Coloradois one of the few states where the ADHA’s chart explicitly notes that a dental hygienist may also own a practice, under its direct-access framework (Unsupervised Practice (Sec. 12-35-124)). Most states still require a dentist to own the practice — see Can a dental hygienist own a practice? for how Colorado compares nationally.
Frequently Asked Questions
Does a dentist have to supervise a dental hygienist in Colorado?
No, not for most services.
The ADHA records a direct-access provision for Colorado — Unsupervised Practice (Sec. 12-35-124) — meaning a dentist's authorization or supervision is not required for most services under it.
Confirm current details with the Colorado Dental Board.
Can a dental hygienist own a practice in Colorado?
Yes — Colorado is one of the few states where the ADHA's chart explicitly notes a dental hygienist may also own a practice, under its direct-access framework (Unsupervised Practice (Sec. 12-35-124)).
Most states require dentist ownership, so this is an exception, not the norm.
Who regulates dental hygienists in Colorado?
Dental Hygienists in Colorado are regulated by the Colorado Dental Board.
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 Colorado give local anesthesia without a dentist present?
Under the ADHA Practice Act chart, local anesthesia in Colorado is listed at general supervision: the dentist must authorize the service before it is provided but does not need to be present.
The Local Anesthesia chart agrees, listing general supervision for both block and infiltration since 1977.
That is different from the direct-access level most other Colorado hygiene functions carry, so treat the authorization step as required and confirm the specifics with the Colorado Dental Board.
Which hygiene functions in Colorado require the dentist to be in the room?
Two functions on the ADHA chart carry direct supervision for Colorado: administering nitrous oxide and using lasers.
Direct supervision means the dentist needs to be present.
Everything else that is listed sits at general supervision or direct access.
The chart does not say which cells carry ADHA's numbered footnotes, so check the Colorado Dental Board's rules for any condition attached to those two functions.
Does the Colorado chart let hygienists diagnose and write prescriptions?
The ADHA chart lists dental hygiene diagnosis, dental hygiene assessment, treatment planning and prescriptive authority at direct access for Colorado, meaning the hygienist provides them as they determine appropriate without specific authorization.
What each of those terms covers in practice is defined by Colorado law, not by the chart, so read the Colorado Dental Board's rules for the scope of a hygiene diagnosis and of any prescriptive authority before relying on either.
Does a Colorado hygienist need extra training before applying silver diamine fluoride?
Yes, according to the rule ADHA quotes.
It conditions SDF application on completing a post-secondary course or continuing education as described in the rule's own subsections, and it places the application in a dental office setting under direct, indirect, or telehealth supervision.
The document does not state course hours or a course provider, so ask the Colorado Dental Board what it currently accepts before relying on a course.
More Colorado & 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 Colorado Dental Board.