Q: What did the tooth fairy use to fix her wand?
A: Toothpaste!

Explanation: The Tooth Fairy leaves small amounts of money under the pillow where small children have left a tooth that recently fell out.  She always has a magic wand.  I suppose that the wand could break and she would need some glue (also known as paste) to fix it.  Because she is the Tooth Fairy she might use tooth-paste.  That’s funny!