Clinical decision-support only. For use by licensed dental professionals. Not a substitute for professional judgment or a complete drug reference. Always verify with primary sources.
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Colorado

Colorado has one of the most expanded dental hygiene practice acts in the U.S.: since 1987, hygienists have been permitted to perform most core services (prophylaxis, scaling/root planing, radiographs, fluoride, sealants, dental hygiene diagnosis) unsupervised, without any dentist authorization or presence, and may independently own dental hygiene practices. Under SB25-194 (2025) and Colorado Dental Board rules effective June 30, 2026, local anesthesia administration also moved to unsupervised practice, while nitrous oxide administration now falls under Colorado's statutory 'indirect supervision' category, which by statute requires only advance dentist authorization, not physical presence.

Verify before relying on this: scope-of-practice regulations change frequently. This entry was last checked against primary sources on 2026-08-30. Confirm current requirements with the Colorado dental board before making decisions based on it.

Permitted functions & supervision required

  • Scaling and root planing

    Unsupervised / independent practice

    Core unsupervised dental hygiene function since 1987 (C.R.S. §12-220-503); dental assistants are explicitly barred from performing it.

  • Local anesthesia administration

    Unsupervised / independent practice

    Moved to fully unsupervised practice under SB25-194, codified at C.R.S. §12-220-503(1)(e.5); Dental Board rules implementing this took effect June 30, 2026. Hygienist must still hold a local anesthesia permit and meet board training requirements (C.R.S. §12-220-411).

  • Nitrous oxide monitoring/administration

    General supervision

    C.R.S. §12-220-504(1)(a) (added by SB25-194, rules effective June 30, 2026) labels this Colorado's 'indirect supervision,' but Colorado's own statutory definition of that term (C.R.S. §12-220-104(9)(a)) does not require the dentist's physical presence (only prior authorization), making it functionally equivalent to 'general' supervision as used elsewhere on this page. Required direct supervision before this rule change.

  • Application of sealants

    Unsupervised / independent practice

    Classified as a preventive-agent service under Colorado's unsupervised dental hygiene provisions; unchanged by SB25-194.

  • Application of fluoride varnish

    Unsupervised / independent practice

    C.R.S. §12-220-503(1)(g); administering/dispensing routine fluoride products is unsupervised, though some agents require a collaborative prescribing arrangement with a dentist under board rules.

  • Taking radiographs (x-rays)

    Unsupervised / independent practice

    C.R.S. §12-220-503(1)(d)(V) lists radiographic/x-ray survey among unsupervised dental hygiene tasks.

  • Independent practice ownership

    Unsupervised / independent practice

    Colorado dental hygienists have been permitted to be sole proprietors of a dental hygiene practice since 1987; C.R.S. §12-220-501(4)(a)-(b) (amended by SB25-194) confirms hygienists may purchase, own, or lease equipment/materials without creating a supervisory relationship.

  • Dental hygiene diagnosis and treatment planning

    Unsupervised / independent practice

    C.R.S. §12-220-503(1)(f) authorizes hygienists to perform dental hygiene assessment, diagnosis, and treatment planning independently, an expanded function very few states grant.

Sources

  1. Dental Hygiene Practice Act Overview: Permitted Functions and Supervision Levels by State American Dental Hygienists' Association, 2022.
  2. SB25-194: Sunset Dental Practice Act (enacted bill text) Colorado General Assembly, 2025.
  3. Rulemaking Underway for the Dental Practice Act: Some Rules Effective June 30 Colorado Dental Association, 2026.