Hehe this is interesting. One of my proudest parenting moments was when my 2nd born lost his first tooth and everyone around him was excitedly going on the about the tooth fairy and was he going to put it under his pillow etc... He quizzed me about it and I told him how it worked. It went like this: Him: so does the fairy keep my tooth then and I just a get a couple of dollars? Me: Well yeah Him: so that's the last I'll see of it? Me: Correct Him: Well she's not having it! I'm keeping it

From there on he never gave up any of his teeth and kept all of them (except the ones he swallowed by accident haha).