I know I have to go back to my dentist to fix a few things on my teeth (need a tooth out, and probably need a filling re-done) i've been thinking about getting the 'laughing gas' or 'sleeping gas' but I have a fear that I won't wake up. I've heard about people having bad re-actions whilst they are out cold, I know its probably not worth the bother for a filling and a tooth out but i've been to the dentist a total of 11 times in 2 months, all of which resulted in injections and being awake during surgery...Kinda getting sick of it. Can anyone put my mind to rest on what the dangers are of bein under the gas during dental surgery? (bare in mind I am 17 years old)