Nitrous Oxide, known to many as laughing gas, is the most commonly used form of sedation in dentistry. It is administered by having the patient breathe in the nitrogen and oxygen mixture, which is carefully monitored by your doctor. You will fall into a euphoric state and feel completely relaxed. All feelings of fear and anxiety fade away, leaving you to sit back peacefully while your dental procedure is performed. Nitrous oxide sedation is very safe and effective.