Studies around the world have assessed the dangers of exposure to nitrous oxide in the dental setting. These have generally concluded that the amount of gas a patient receives during treatment is too small to be hazardous.
Research is less conclusive regarding the exposure of dental staff to nitrous oxide gas. And government regulations urge precautions be used to reduce the levels of unscavenged gas staff experience. For this reason you may be asked to wear a small plastic mask as well as minimize how much you talk. If this happens be assured your dental team is simply following current best practices about how to create the safest possible environment for all.