The anesthetic nitrous oxide can be used to relieve pain. It also serves as a moderate sedative. As a result, it is occasionally administered before dental treatments to improve relaxation and minimize anxiety. Nitrous oxide gas acts quickly as a sedative, but the effects wear off quickly. Nitrous oxide is completely harmless. It is not absorbed by any body tissues and is eliminated through the lungs. It is best to avoid using nitrous oxide if you are pregnant or planning to become pregnant because it can cause birth defects. If you do need anesthesia, then nitrous oxide is one of the safest options available.