Parents present the concept of the Tooth Fairy to kids as a fun way to celebrate the loss of their baby teeth while adding another magical being to the pantheon of childhood gods.
But if you think about it the Tooth Fairy is the most horrifying of these imaginary beings, a fairy who gave up life among the other fairy folk to collect teeth from human kids- while they're sleeping.
And, as this strip from Electric Bunny Comics shows, the logistics of how Tooth Fairies collect the teeth can keep a kid up at night...
-Via Geeks Are Sexy