Scope of practice and supervision levels for dental hygienists
What this domain tests
Scope and supervision questions ask not only “can a hygienist do this?” but “under what level of authorization, and with what documentation?” Montana uses supervision categories in statute and Board rule; learn the Board’s definitions rather than importing another state’s labels.
Core rules
- Licensed hygienists may provide services within the dental hygiene scope: prophylaxis, scaling and root planing, polishing, fluoride, sealants, radiographs, and patient education. Local anesthesia and nitrous oxide require additional training and any permit or endorsement the Board requires.
- Supervision levels are set by the Act and rules. Direct supervision generally means the dentist is physically present in the office and available; indirect supervision generally requires prior authorization with the dentist in the office; general supervision generally allows authorized care when the dentist is not on site. The exact Board definitions control.
- A dentist must examine the patient and authorize hygiene care as the rules require. Standing orders or written protocols may support general supervision, but they do not expand scope.
- A public health hygienist setting may have separate authorization; do not assume private-practice supervision rules apply unchanged.
Worked example
A hygienist in a general-supervision office wants to perform scaling on a new patient whose only contact was a phone call. If Montana rule requires a dentist’s examination or written authorization before that service, the hygienist must wait. The clinical task is in scope, but the supervision prerequisite is not met.
Traps
The biggest error is equating “general supervision” with “unsupervised.” Another is assuming an expanded-function certificate travels automatically to Montana. Always separate procedure, setting, and supervision.