Nitrous oxide or “laughing gas” can be used to help make your dental visit more comfortable. It is a safe and effective means of sedation. Nitrous oxide is mixed with oxygen inhaled through a mask that fits directly over your nose. When using nitrous oxide for certain dental procedures its purpose is not to put you to sleep, but to make you will feel relaxed and calm. You will still be able to hear your dentist and are able to respond. The effects of nitrous oxide are gone once the you stop inhaling the gas.