Here's a true story about baby teeth:
When we were kids, my sister jumped down a bunch of stairs and hit her mouth on the ground, following which she was missing her two front teeth. But they couldn't find the teeth, so they thought she swallowed them.
Well, it was not that big a deal because they were baby teeth and she would just be missing those two teeth until the time for her adult teeth to come in....Well the two baby teeth grew back out - it turns out they had been shoved back up into her head. Eventually she lost them just like regular baby teeth and then her adult teeth came in.