Nitrous oxide sedation in pediatric dentistry, also known as "laughing gas," is a gaseous medication that is inhaled through a nasal mask during medical procedures. While under the effects of nitrous oxide, patients typically feel relaxed and drowsy, but remain conscious and responsive. After the treatment is completed, the nitrous oxide is stopped, and the patient is only inhaling oxygen until the mask is removed. The effects of the nitrous oxide wear off quickly, allowing patients to drive themselves home after their appointment.