New York okays hygienists' administration of nitrous oxide.
D000766:Anesthesia, Dental; D000776:Anesthesiology / Q000331:legislation & jurisprudence*; D018685:Anesthetics, Inhalation / Q000008:administration & dosage*; D003756:Dental Hygienists / Q000331:legislation & jurisprudence*; D006801:Humans; D009518:New York; D009609:Nitrous Oxide / Q000008:administration & dosage*
D018685:Anesthetics, Inhalation; D009609:Nitrous Oxide