Nitrous oxide, also called laughing gas, is a gas used by dentists for anxiety and pain control. It is a safe, effective sedative that is mixed with oxygen. You must constantly inhale the gas for the effects to last.

Nitrous oxide reduces anxiety, assists the effectiveness of anesthesia, and creates a mild, temporary feeling of euphoria. A steady stream of the nitrous mixture is necessary to maintain its effects. When the dental procedure is complete, Dr. Oh switches the nitrous off, and you spend several minutes breathing straight oxygen. This action flushes the nitrous out of your system, making it safe to drive home.