Nitrous Oxide Sedation. Also known as "laughing gas", this colorless gas is inhaled through a mask or nosepiece. It can cause feelings of euphoria, calmness, and sleepiness, and can also help relax muscles.

 

Patients can quickly return to normal after stopping the inhalation, but may feel groggy afterwards. Nitrous oxide is often used for simple dental exams and cleanings, or for children who are anxious about the dentist or have a strong gag reflex.