N.D. Cent. Code § 43-20-03
As used in this chapter, "dental hygiene" and the practice thereof means the removal of accumulated matter from the natural and restored surfaces of teeth and from restorations in the human mouth, the polishing of such surfaces, and the topical application of drugs to the surface tissues of the mouth and to the surface of teeth if such acts are performed under the direct, indirect, or general supervision of a licensed dentist. General supervision may be used if the procedures are authorized in advance by the supervising dentist, except procedures which may only be used under direct supervision as established by the board by rule.
Only a person licensed as a dental hygienist may be referred to as a dental hygienist. Additional tasks permitted to be performed by licensed dental hygienists may be outlined by the board of dental examiners by appropriate rules.
N.D.C.C. § 43-20-03