Children have 20 baby teeth- 10 on the top and 10 on the bottom. At 25 cents each, that would be a potential profit of $5.00. These days, that's hardly enough to buy a Happy Meal! But at least, you look cool without a tooth. I don't think we ever believed in the tooth fairy after we were four years old but we played along to get the quarters. Then, you could get all kinds of cool things for a quarter. Happy National Tooth Fairy Day everyone!