I love laughing gas. I always use it when I go to the Dentist. My insurance doesn't cover it but I still want it. I am cheap most of the time but I will gladly pay($20) for the nitrous oxide. My childrens dentist charges $60 and wants them to have it. I'm not sure we have a choice. Since I use it I like that my kids can have it, but think he charges way too much. My kids are very good at the dentist, but I'm sure it really helps with kids that are very scared. I think that if you are seeing colors with the laughing gas then they have it up too high. I would not go to a dentist that didn't have it.