Dental Hygiene Assessment: Scope and Supervision by State

In 19 of the 51 jurisdictions tracked by the ADHA's Practice Act Overview (8.24.26 update), Dental Hygiene Assessment is listed as permitted hygienist scope: Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, DC, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Maine, Oregon, South Dakota, and Utah.

The required supervision level ranges from a dentist needing to be present to a hygienist's own direct-access determination, and three of those 19 list more than one setting at once.

The other 32 jurisdictions show no listed supervision level for this specific function.

That 19-state footprint makes assessment considerably more broadly listed than its closest chart neighbor, Dental Hygiene Diagnosis, listed in just 6 of 51 — though still well short of the chart's most universal rows, like scaling and root planing, listed in all 51.

On the ADHA chart, Dental Hygiene Assessment is its own row, distinct from two functions it sits beside: Dental Hygiene Diagnosis (identifying a condition from clinical findings) and Treatment Planning (proposing the sequence of care that follows).

Assessment is the step before both — gathering the clinical data itself.

In general clinical usage, that means reviewing health history, examining hard and soft tissue, charting periodontal findings, and recording what the exam turns up; the chart itself lists the function without defining what it includes.

Diagnosis draws a conclusion from that data; treatment planning decides what happens next.

The chart tracks all three as separate functions with their own supervision levels, so permission on one doesn't carry over to another.

This is also a narrower question than the general scope of the role covered in our dental hygienist career guide — that guide covers the full role; this article covers only the Dental Hygiene Assessment row on the ADHA chart, in the states where it's listed.

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

• D — Direct Supervision: the dentist needs to be present.
• ID — Indirect Supervision: the dentist must authorize the procedure and be in the dental office while it's performed.
• 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.

Three of the 19 listed jurisdictions carry more than one setting at once — never a range, always separate settings depending on the practice environment.

Alaska lists G/A/CP, three separate settings.

Indiana lists D/A and Iowa lists G/A, each two settings.

Quote each cell exactly as the chart lists it.

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

Nineteen list a level at all; the remaining 32 show no listed supervision level for this specific function.

General supervision (G) is the most common single level, listed alone in ten jurisdictions — Arizona, California, Connecticut, Delaware, DC, Florida, Hawaii, Idaho, Illinois, and Oregon.

Direct Access (A) applies alone in Colorado, Maine, and Utah.

Direct supervision (D) applies alone in Arkansas and Georgia.

Indirect supervision (ID) applies only in South Dakota.

The remaining three — Alaska, Indiana, and Iowa — list more than one setting, as covered above.

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

Dental hygiene assessment's 19-of-51 footprint sits well above two functions it's easy to conflate it with on the same chart: Dental Hygiene Diagnosis, listed in just 6 of the 51 jurisdictions, and Treatment Planning, listed in 12.

It's broader, too, than the chart's tightest rows, like placing sutures (4 of 51) and Botox (3 of 51).

It's still well short of near-universal rows like scaling and root planing, listed in all 51, and local anesthesia, permitted in the large majority of states — and narrower than soft tissue curettage, listed in 43 of 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 only the Dental Hygiene Assessment row.

A "-" on this chart means Dental Hygiene Assessment 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 19 jurisdictions where a level is listed, confirm exactly what it requires in practice, since practice acts and their interpretation change over time.

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 rest of what a hygienist can and can't do, 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.