Nitrous Oxide Sedation (laughing gas) may help calm the anxious or nervous child. Nitrous Oxide is a gas mixed with oxygen that is breathed through the nose and has a calming effect. Patients are still conscious and can talk to their dentist during their dental visit. Nitrous Oxide can help relax and anxious or nervous patient without the need for heavy sedation or General Anesthesia at the hospital. Nitrous Oxide has many benefits and the disadvantages are few. It is one of the safest and non-allergic anesthetics available, and there is a full and complete recovery following the dental procedure. After treatment, the Nitrous is turned off while the Oxygen remains to flush any remaining gas from the lungs.