Scope of Practice and Supervision of Dental Hygienists in Iowa
This domain tests what an Iowa dental hygienist may perform, and under whose authority - the single most heavily examined area on the jurisprudence exam because most violations are scope violations.
What dental hygiene includes
Iowa's dental hygiene scope covers educational, preventive, and therapeutic services delegated by a licensed dentist: prophylaxis, scaling and root planing, polishing, fluoride, sealants, radiographs, periodontal charting, and patient education. Diagnosis, treatment planning, prescribing, and irreversible surgical procedures remain with the dentist.
Supervision levels
Board rules define supervision categories and attach delegated tasks to each:
- Direct - the dentist is on the premises, has authorized the service, and evaluates the result.
- Indirect - the dentist has authorized the service and is available, but need not be in the room.
- General - the dentist has examined, diagnosed, and authorized care but is not on site.
- Public health supervision - a hygienist may serve specified settings (schools, Head Start, nursing facilities, community clinics) under a written agreement with a dentist, with referral for diagnosis and follow-up. Expanded functions carry their own training and supervision requirements; confirm the specific function in 645-IAC ch. 250 before performing it.
Worked example
A hygienist runs a school sealant clinic: she screens, seals eligible molars, and sends each family a note recommending a dental home. That is lawful public health supervision. When one child arrives with facial swelling and pain, she does not diagnose an abscess or dispense anything - she refers urgently and documents the referral. Scope is defined by the task, not by the setting.
Traps
Reading "general supervision" as independent practice; assuming a dentist must always be in the building; accepting verbal orders for irreversible procedures; failing to document which dentist authorized care; and letting a public health protocol drift into diagnosis.