Lucien Littlefield is a dentist who believes in giving generous doses of laughing gas to the patients. On this occasion when a girl arrives at his office with an aching molar, he administers even more than the usual quantity. Under the influence of the laughing gas, she leaves the office and trips blithely along through all kinds of dangerous traffic, makes love to a married man while his wife looks on and succeeds in getting herself into several difficulties. In the meantime the dentist pursues with a restorative.