How safe is safe?
D000766:Anesthesia, Dental / Q000592:standards; D000769:Anesthesia, Inhalation / Q000592:standards; D001237:Asphyxia / Q000517:prevention & control; D003813:Dentistry; D009609:Nitrous Oxide / Q000008:administration & dosage
D009609:Nitrous Oxide