Also called laughing gas, nitrous oxide is a mild sedative that promotes a stress-free experience. Patients inhale nitrous oxide through a face mask. The doctor will control the amount of nitrous oxide you receive to ensure your comfort and safety. You will begin to relax and not recognize pain, so the doctors can perform treatments while you remain comfortable. Nitrous oxide is safe for patients of all ages, and its effects subside immediately so you can enjoy activities as usual after you leave the dental office.