"Wow. That is really loose."
"What if it falls out tonight while I'm sleeping? Or what if I swallow it while I'm asleep? What if I lose it in the bed? How will I give it to the Tooth Fairy? How will she know I lost my tooth if I can't give it to her? What do I do? How am I going to collect my cash? Why are you laughing, Mom? This is serious."