Dad, Are You The Tooth Fairy? By Jason Alexander

Summary from the publisher:

When Gaby overhears some older kids on the playground saying that the tooth fairy is just make-believe, he goes straight to his father to find out the truth. The enchanting tale his dad tells him of a time long ago when mysterious and magical creatures lived on the earth will delight and entertain children and adults alike. For any child who has ever wondered about the existence of the tooth fairy, this original and reassuring story will satisfy their curiosity and give them the power to believe magical things can happen!

I came across this story as I was looking on Storylineonline.net.  This story is written by the actor, Jason Alexander.  This is the story that he told his son Gaby as he was questioning the truth behind the tooth fairy.  Listening to this story on the computer by the author makes this a story a little more heartwarming.  However, it is a little long and very "wordy."  But if parents are looking for a way to explain the truth behind the tooth fairy, this story would do the trick.  It is an honest answer to the question that so many parents dread, but at the same time, he keeps the magic alive throughout his explaination.  It should however come with a warning (it does com with a warning in the online version) that this is going to give away the truth behind the question.  I love the animated and playful pictures that help to tell this whimsical tale.