Many moons ago,I used to live with my grandad
When I was about 8/9 my mother bought me some dolls-flower fairies (same doll,blonde/dark hair and different outfits)
Anyway,If you collected tokens from the packet,you could send off for a small plastic box to store teeth (this was the 80's)
She sent off and a small,purple box showed up a month later
A few months later,the box came into its own when a tooth fell out
Tooth was put inside it and stuffed under my pillow
Next morning there was the 10p from the fairy but the tooth was still in the box
Quick as a flash,my grandad told me that the tooth fairy had arthritis in her fingers and couldn't open it
Took me longer than I care to admit for the penny to drop,that it wasn't the tooth fairy that had arthritis...