Baby Teeth Box

This is the little box I keep my son's baby teeth in.
He is 26 now.
What the hell am I to do with these teeth.
I can't throw them out, but I wish I did when he was young.
What do other people do with their children's baby teeth?

What do you use your box for Ernie?? https://www.blipfoto.com/entry/1995748926648487252