Some children are given nitrous oxide/oxygen, or what you may know as laughing gas, to relax them for their dental treatment. Nitrous oxide/oxygen is a blend of two gases, oxygen and nitrous oxide. Nitrous oxide/oxygen is given through a small breathing mask which is placed over the child?s nose, allowing them to relax, but without putting them to sleep. The American Academy of Pediatric Dentistry, recognizes this technique as a very safe, effective technique to use for treating children?s dental needs. The gas is mild, easily taken, then with normal breathing, it is quickly eliminated from the body. It is non-addictive. While inhaling nitrous oxide/oxygen, your child remains fully conscious and keeps all natural reflexes.