Md. Code, Health Occupations § 4–206.2

(a) Subject to the requirements of subsections (b) and (c) of this section, a dental hygienist may administer nitrous oxide to a patient provided the administration of nitrous oxide is under the supervision of a dentist who:

(1) Is physically present on the premises; and

(2) Prescribes the administration of nitrous oxide by the dental hygienist.

(b) Before a dental hygienist may administer nitrous oxide under subsection (a) of this section, the dental hygienist shall successfully complete the following:

(1) Any educational requirements established by the Board; and

(2) A written and clinical examination as required by the Board.

(c) A dental hygienist shall complete the educational requirements established by the Board under subsection (b)(1) of this section through an accredited dental hygiene program.