This paper reviews the potential occupational hazards associated with
chronic exposure to nitrous oxide. The evidence that chronic exposure
to the gas produces problems related to reproduction in dental personn
el is Convincing. Recent evidence suggests that scavenging systems dec
rease the adverse effects which nitrous oxide has on fertility of dent
al surgery assistants. However, even in the presence of scavenging sys
tems trace levels of the gas can exceed recommended minimum levels.