Do Hygienists Have Prescriptive Authority? By State

In just 9 of the 51 jurisdictions tracked by the ADHA's Practice Act Overview (8.24.26 update), prescriptive authority is listed as permitted hygienist scope: Colorado under Direct Access, Oregon under Collaborative Practice, the District of Columbia, Kentucky, Nevada, New Mexico, and Tennessee under General supervision, and Maine and Maryland under Direct supervision.

The remaining 42 jurisdictions show no listed supervision level for this function at all.

Where it is listed, the chart names only the required supervision level — it does not say what a hygienist may actually prescribe under that authority.

That detail sits with each state's practice act and dental board, not with this chart.

"Prescriptive authority" on the ADHA chart is its own function row — the authority to prescribe, tracked separately from every clinical procedure on the same overview.

Listing a supervision level for it means the chart records that some form of hygienist prescriptive authority exists in that jurisdiction; it does not spell out what may be prescribed there.

That distinction matters because prescribing is otherwise treated as squarely outside hygienist scope — writing a prescription is the dentist's responsibility in the large majority of states.

This chart is the documented exception surface: the specific jurisdictions where some form of prescriptive authority is listed at all.

What it actually covers in each of those places is a question only that state's dental board can answer.

The codes come directly from the chart's own legend:

• D — Direct Supervision: the dentist needs to be present.
• G — General Supervision: the dentist authorizes the service beforehand but need not be present.
• A — Direct Access: the hygienist can provide the service based on their own determination, without specific authorization.
• CP — Collaborative Practice: the hygienist may practice without supervision, under a collaborative agreement with a licensed dentist.
• "-" — not listed as a permitted function in the chart. That isn't the same as prohibited — it means the chart records no permitted supervision level for that state, so confirm directly with the board.

Prescriptive authority is also simpler than most rows on this chart in one respect: none of the 9 listed jurisdictions shows more than one supervision level (a split by private versus public setting, or a wrapped combination like G/A/CP, the way several other functions do).

Every jurisdiction that lists it lists exactly one level, even where that single level is Oregon's Collaborative Practice.

Quoting the chart as written, here is the supervision level listed for every jurisdiction.

General supervision (G) is the most common of the 9 listed levels, covering the District of Columbia, Kentucky, Nevada, New Mexico, and Tennessee.

Colorado is the only jurisdiction listing Direct Access (A) — the hygienist's own determination, without specific authorization, for this function.

Oregon is the only jurisdiction listing Collaborative Practice (CP) — practicing without supervision under an agreement with a licensed dentist.

Maine and Maryland are the only two requiring Direct supervision (D), meaning the dentist must be present.

The remaining 42 jurisdictions show no listed supervision level for prescriptive authority at all.

Source: ADHA Dental Hygiene Practice Act Overview, 8.24.26 update. "-" means the function is not listed as permitted, not that it is prohibited.

Prescriptive authority sits near the most-restricted end of this 22-function chart. Scaling and root planing and x-rays are listed as permitted in all 51 jurisdictions. Local anesthesia is nearly as broad, unlisted in only 2. Soft tissue curettage is unlisted in 8.

Prescriptive authority, unlisted in 42, is more restricted than every function this site has covered from this chart except two: Botox, unlisted in 48 of 51, and dermal fillers, a separate row unlisted in all 51.

Don't assume permission for one function on this chart implies permission for another — the ADHA lists each one separately, and this article covers prescriptive authority specifically. Nitrous oxide is governed independently too, with its own supervision rules.

A "-" on this chart means prescriptive authority isn't listed as a permitted function in that state's row — it does not mean the state prohibits it outright, only that the chart doesn't record an authorized supervision level there.

Even in the 9 jurisdictions where a level is listed, the chart doesn't say what a hygienist may actually prescribe under it — that detail lives in the state's practice act and board rules, not on this chart.

Start with your state dental board's practice act, and treat this chart and this article as a snapshot dated to 8.24.26 rather than a permanent rule.

For the broader picture of what a hygienist can and can't do — including why prescribing is treated as dentist-only in the large majority of states — see our full breakdown of hygienist scope limits.

This article is general information, not legal or clinical advice. Scope-of-practice and supervision rules vary by state and change over time — confirm current requirements with your state dental board.