Nitrous Oxide/Oxygen inhalation, also known as “laughing gas,” is a mild, colorless, sweet smelling form of sedative used by many dentists to help facilitate the patient’s dental treatment needs.  It is safe and tolerated well by most children. Nitrous Oxide/oxygen inhalation can reduce anxiety and hyperactive gag reflex, and raise the pain-reaction threshold. It may produce sensations of euphoria, drowsiness, warmth and tingling of the hands and feet resulting in an increase of tolerance for longer appointments.