My almost 7yr old lost his first tooth! So for my tiny thing I made a teeny tiny tooth fairy note. Its just made from regular paper and tiny "tooth fairy handwriting". The envelope I decorated with red and blue like the old air mail envelopes used to be (at least from what I remember). I put a little glitter in there as well! He loved getting the tiny note and was so careful opening it to read.
In case you can't read it, it says " Dear Levi, Congratulations on loosing your first tooth! Remember to brush at least twice a day. Love, The Tooth Fairy"
I also made the pillowcase with pocket to put them in.