First, draw a charming tooth shape on an index card. If you want, you can find tooth shape clip art online, but if that seems like too much effort, just draw an upside-down mountain with two peaks.
Put one card on top of the other, and cut the tooth shape out of both cards. Next, draw a letter or number on the card. I used an "E" for Eva, but you could also do a number, as in "#1" for the very first tooth lost. Or if you're artistic, you could draw a simple design. But keep it simple. You're going to use sew over this guideline.
Use a zig-zag or straight stitch to sew right over the top of the letter or number. I changed the thread to something bright.
Next, zig-zag around the side and bottom edges, leaving the top open for the money slot.