Colgate Kid's World

Since the site has been created by Colgate, all the games involve either teeth or germs, but they are fun and you get to learn some interesting facts like - the toothbrush is 500 years old or that elephants don't get their last set of permanent teeth until they turn 23!  Also, this is one of the few sites that lets you to rate their games - so be sure to tell them if you think some of them are lame.