---
type: "Bill"
title: "Generally revise laws related to the supervised practice of dental hygienists"
description: "Generally revise laws related to the supervised practice of dental hygienists"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2025"
identifier: "HB 321"
citation: "Montana HB 321 (2025)"
classification: ["bill"]
subjects: ["Health", "Health Care Services", "Professions and Occupations Generally", "Professions and Occupations A-D", "Rule Making"]
status: "enacted"
primary_sponsors: ["Nelly Nicol"]
version_count: 23
action_count: 36
vote_count: 6
first_action: "2024-12-13T15:37:51+00:00"
last_action: "2025-04-04T01:52:02+00:00"
source: "openstates"
source_identifier: "ocd-bill/de2d4ada-9a86-499f-b644-0fc823fd3baa"
source_url: "https://bills.legmt.gov/#/laws/bill/2/LC3074?open_tab=sum"
source_hash: "ece66ba2f9be0143a9033d7c565d800ab96e28c61baf75126821efc6fccb8d43"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana HB 321 (2025) — Generally revise laws related to the supervised practice of dental hygienists

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **HB0321_1(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=275634)
2. **HB0321_1(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=275883)
3. **HB0321_1(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=276713)
4. **HB0321_1(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=279844)
5. **HB0321_1(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=286498)
6. **HB0321_1(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295233)
7. **HB0321_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=274966)
8. **HB0321_2.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295232)
9. **HB0321_X(1).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295238)
10. **HB0321_X(10).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=316688)
11. **HB0321_X(11).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=320271)
12. **HB0321_X(12).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=324137)
13. **HB0321_X(13).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=326779)
14. **HB0321_X(2).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295388)
15. **HB0321_X(3).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295408)
16. **HB0321_X(4).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295409)
17. **HB0321_X(5).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295711)
18. **HB0321_X(6).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=305237)
19. **HB0321_X(7).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=305238)
20. **HB0321_X(8).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=305239)
21. **HB0321_X(9).pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=310748)
22. **HB0321_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=295236)
23. **LC3074.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=273472)

## Votes

- Do Pass — **99–1** (pass) · lower
- do_pass — **20–0** (pass) · lower
- Do Concur — **50–0** (pass) · upper
- be_concurred_in — **12–0** (pass) · upper
- Do Concur — **49–0** (pass) · upper
- Do Pass — **98–1** (pass) · lower

## Sponsors

- Nelly Nicol — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2024-12-13T15:37:51+00:00** (LC) Drafter Assigned
- **2025-01-20T16:46:11+00:00** (LC) Draft in Legal Review
- **2025-01-20T17:04:47+00:00** (LC) Draft in Edit
- **2025-01-22T16:18:41+00:00** (LC) Draft in Input/Proofing
- **2025-01-22T17:56:42+00:00** (LC) Draft in Final Drafter Review
- **2025-01-23T00:42:49+00:00** (LC) Draft in Assembly
- **2025-01-24T16:08:20+00:00** (LC) Draft Ready for Delivery
- **2025-01-27T15:43:04+00:00** (LC) Draft Delivered to Requester
- **2025-01-27T22:25:33+00:00** (H) Introduced
- **2025-01-28T17:58:41+00:00** (H) Referred to Committee - (H) Business and Labor `referral-committee`
- **2025-01-28T20:03:21+00:00** (H) First Reading `reading-1`
- **2025-01-28T22:08:11+00:00** (H) Hearing - (H) Business and Labor
- **2025-01-31T18:15:55+00:00** (H) Committee Executive Action--Bill Passed - (H) Business and Labor `committee-passage`
- **2025-01-31T19:10:03+00:00** (H) Committee Executive Action--Bill Passed - (H) Business and Labor `committee-passage`
- **2025-01-31T20:27:07+00:00** (H) Committee Report--Bill Passed - (H) Business and Labor `committee-passage`
- **2025-02-05T20:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2025-02-05T21:11:00+00:00** (H) 2nd Reading Passed `reading-2, reading-2`
- **2025-02-06T20:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2025-02-06T21:56:00+00:00** (H) 3rd Reading Passed `passage, reading-3`
- **2025-02-06T23:02:01+00:00** (H) Transmitted to Senate
- **2025-02-07T20:22:51+00:00** (S) First Reading `reading-1`
- **2025-02-14T18:59:56+00:00** (S) Referred to Committee - (S) Business, Labor and Economic Affairs `referral-committee`
- **2025-02-15T15:54:27+00:00** (S) Hearing - (S) Business, Labor and Economic Affairs
- **2025-02-24T17:55:09+00:00** (S) Committee Executive Action--Bill Concurred - (S) Business, Labor and Economic Affairs
- **2025-02-24T20:23:00+00:00** (S) Committee Report--Bill Concurred - (S) Business, Labor and Economic Affairs
- **2025-03-17T19:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2025-03-17T19:19:00+00:00** (S) 2nd Reading Concurred `reading-2, reading-2`
- **2025-03-18T19:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2025-03-18T20:30:00+00:00** (S) 3rd Reading Concurred `passage, reading-3`
- **2025-03-18T20:30:40+00:00** (H) Sent to Enrolling
- **2025-03-19T17:40:06+00:00** (H) Returned from Enrolling
- **2025-03-21T23:00:36+00:00** (H) Signed by Speaker `passage`
- **2025-03-24T23:00:16+00:00** (S) Signed by President `passage`
- **2025-03-25T15:11:00+00:00** (H) Transmitted to Governor `executive-receipt`
- **2025-04-03T20:31:26+00:00** (H) Signed by Governor `executive-signature`
- **2025-04-04T01:52:02+00:00** Chapter Number Assigned `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/de2d4ada-9a86-499f-b644-0fc823fd3baa`. Confidence: reported (aggregated from official Montana legislature records).