When Willow's back teeth came through as a toddler, they had no enamel on them… so when she was fours years old, she went under a general anesthetic to have them capped, to protect the teeth and preserve the space for her adult teeth. Today one of her four 'metal' teeth came out… or, to be precise, Darci sat on her and pulled it out!
So, what exactly do you think the tooth fairy should pay for robo-teeth?