I know that a previous poster covered what can happen if you take too much of a med, but I have to add something also. I think what you're doing is very dangerous. I would be curious as to how old you are. Risking heart damage, eye damage, liver damage, etc. might not seem really scary to you right now, but down the road if you get sick and a a doctor orders tests and you find out something vital is not functioning as it should....this could be the cause. I would beg of you to quit messing with your medicine and find something else to occupy your mind. Also taking 15-20 pills at a time, for a toothache is risky. Just for future info.......tylenol can also harm your liver in a very bad way. So, please quit experimenting with any medicines.