Local Anesthesia and Nitrous Oxide Administration Authority
Additional authority
Michigan allows a licensed dental hygienist to apply to the Board for authority to administer local anesthesia and nitrous oxide. The hygienist must complete a Board-approved course with didactic and clinical components, hold a current license in good standing, and submit the required application and fee. The authority is specific: it covers the agents and techniques approved by the Board, not general anesthesia or prescribing.
Practice conditions
Local anesthesia must be administered under direct supervision: the dentist must be physically present in the office, have examined the patient, and be available to manage emergencies. Nitrous oxide also requires the dentist's authorization and appropriate monitoring. The office must have emergency equipment, oxygen, suction, and drugs; the hygienist must document informed consent, the agent and dose, vital signs, and patient response.
Worked example
A hygienist with local anesthesia authority is scheduled alone on a Saturday. The dentist is out of town but reachable by phone. The hygienist cannot administer the anesthetic because direct supervision requires physical presence. If the dentist is in the building but seeing another patient, direct supervision is generally satisfied if the dentist has examined the patient and is immediately available.
Traps
Do not assume the hygiene license alone includes local anesthesia. Do not confuse direct with general supervision. Do not skip the pre-procedure health history or informed consent. Nitrous oxide requires scavenging and monitoring; a hygienist without the additional authority cannot administer it.