Nitrous oxide.
D000766:Anesthesia, Dental / Q000009:adverse effects*; D003797:Dental Staff; D005260:Female; D006801:Humans; D008297:Male; D009609:Nitrous Oxide / Q000009:adverse effects*; D009784:Occupational Diseases / Q000139:chemically induced*
D009609:Nitrous Oxide