1. What is "happy gas"? Happy gas, or nitrous oxide, is a mild sedative used to help patients relax during dental procedures. It induces a feeling of calmness, euphoria, and reduces anxiety. 2. How does it work? Nitrous oxide is inhaled through a small mask placed over the nose. It works quickly by slowing down the body’s response to pain and fear without causing unconsciousness.... https://www.shifadental.net/what-to-know-about-happy-gas-when-getting-nitrous-at-the-dentist/