Minnesota Dental Practice Act: Statutes, Board Rules, and Dental Hygiene Scope of Practice
Two layers of law
Minn. Stat. ch. 150A is the Dental Practice Act; Minn. R. ch. 3100 contains the Board of Dentistry's rules. The Board licenses dentists, dental hygienists, and dental therapists and disciplines licensees, but it cannot invent scope - the outer boundary is set by statute, and the rules supply definitions, supervision mechanics, and recordkeeping detail. If a rule and the statute conflict, the statute controls.
Where the scope line falls
Dental hygiene services generally include assessment, prophylaxis, scaling and root planing, polishing, sealants, fluoride, radiographs, and patient education. Minnesota permits hygienists to add expanded functions such as local anesthesia and nitrous oxide only after board-approved additional education and certification. Irreversible procedures, diagnosis reserved to dentists, and prescribing remain outside hygiene scope. A dentist may delegate only what the Act allows; an improper delegation never converts a prohibited act into a lawful one.
Worked example
A dentist tells the hygienist to "just finish the small occlusal composite while I'm at the front desk." The hygienist declines. Restorative placement is outside dental hygiene scope, and the dentist's instruction does not transfer authority. Documenting the refusal and the referral is the defensible response; doing the filling exposes both licensees to discipline for practicing or aiding practice beyond scope.
Traps
- Treating a Board newsletter or FAQ as binding law instead of the statute and rules.
- Assuming anything a dentist may perform can be delegated.
- Believing on-the-job training or CE hours alone authorize expanded functions.
- Forgetting that helping an unlicensed person perform dental procedures is itself a violation.