2004-4-10 2002-7-29 Nitrous oxide, also known as "laughing gas," is used for its calming effect. It's a colorless, almost odorless gas that is combined with oxygen, then administered to you through a small mask that covers your nose. It can help to relax you, ease your fear and make you feel more comfortable during your dental treatment. 108773 text/html 1.0 EN index,follow nitrous oxide laughing gas dental treatment calming relax family dentistry Nelson Family Dentistry - Nitrous Oxide text