When a child wants to keep his or her tooth after it falls out, this letter from the Tooth Fairy explains that it's just fine to do so.
Text of the letter:
Congratulations on losing your tooth! And what a nice, shiny tooth it is.
I hear that you want to keep it. That's just fine! I have plenty of teeth in my collection, and I understand how neat it is to hold onto your own tooth. Keep it in a safe place, so you don't lose track of it.
I know that technically I give kids money in exchange for their teeth, but even though you're keeping yours I've left a little surprise for you anyway.
Please keep up with the brushing and flossing, and be sure to visit the dentist for a cleaning and check-up. You're doing a great job!
Next time you lose a tooth, I hope you let me have it, but if you would rather add it to your own collection, that's all right, too. Just write me a little note so I know not to take it.
The Tooth Fairy