Nitrous gas allows you to relax during your treatment, and resume your normal activities after your appointment! Nitrous oxide is best suited for cases of mild to moderate anxiety and is the most frequently used method. Nitrous oxide is administered through a nosepiece that releases gas when you inhale. You will feel the effects within minutes and these effects are completely gone within minutes. Whether you require a single filling or are looking for a complete smile makeover, anxiety-free dentistry can help you achieve optimum dental health in the most comfortable way possible.