Nitrous oxide, sometimes called “laughing gas,” is one option we offer to help make you more comfortable during certain procedures. You will be able to hear and respond to any requests or directions the dentist may have. Your dentist will ask you to breathe normally through your nose, and within a few short minutes you should start to feel the effects of the nitrous oxide. Ultimately, you should feel calm and comfortable. The effects of nitrous oxide wear off soon after the mask is removed.