Laughing gas also known as 'nitrous oxide' has been used for over 100 years...it has been used on millions of patients all over the world. It is so mild that only a minute or two after taking the mask of the effects wear off...it is not make them incoherent to instruction from the dentist...laughing gas relaxes kids and removes the anxiety....it will make your child coming back to the dentist a lot easier the next time. If you are looking to take your child to a pediatric dentist read more by clicking the link to learn more about nitrous oxide.