Nitrous oxide (N2O) is referred to as laughing gas. The dentist used it as a local sedation method; Nitrous oxide is effective as a sedative because it relaxes patients. It emits the pleasurable feelings. Nitrous oxides useful for dental treatment and it work quickly and effectively. Dentist considered the Nitrous oxide is safe for sedation method. Nitrous oxide is a very safe, mild sedative that will help you remain relaxed during dental procedures.