Well I was went to school for dental assisting and was an orthodontic assistant before coming a SAHM so here is what I know. Most dentist are not in it to just take your money although I am sure there are some out there who are trigger happy when it comes to drilling. haha But doing fillings on kids is much harder than on adults so most pediatric dentist only do fillings if they are really needed. With that said there is still some wiggle room. Some dentist will look and see problem areas that could be filled but are so small that it would be a very small filling so they will not fill it and just watch it and then if it gets larger over the next few years then fill it. Other doctors think just fill it now while it's super small so it they don't have to spend too much time in your child's mouth (which is easier on them) and it also doesn't take that much material to fill the cavity. It's really not a good idea to wait until it actually hurts your child because by that time it could mean way too much decay which could mean damage to the nerve or the entire tooth could the need to be removed. I would say to just go back in and talk to your dentist...have him explain what type of cavities he sees. If some are the really, really small ones you could ask to wait on those. Just do the bad ones first and then just keep an eye on some of the others.....if they start to grow deeper then you know to get those ones taken care of.