☆.A.
My son (a card-carrying member of Future Hoarders of America) has written a not to the tooth fairy with every lost tooth, asking if he can keep the tooth, because he is "collecting teeth". LOL
I tease him that someday he can make a necklace for his wife.
He keeps them in his little tooth-shaped box.
p.s. My son has a friend, a 3rd grader, that still has his complete set of baby teeth! :)