How to Make a Tooth

My kids came home with a huge stash of candy after last night's Trick-or-Treat session.  After I checked all of it, they started munching away.  It looked like they intended to eat the entire supply in one sitting. 

"Wait a minute," I said.  "Only four little pieces.  We don't need you rotting your teeth out tonight!"

"But Mama," my nine-year-old son said. "Teeth are easy to make."

I  looked at that boy sideways.  "They are?"

"Yeah.  All you have to do is get some milk and let it go stale. When it dries out, you'll see some powdered stuff left.  Take the powdered stuff and shape it into a tooth, because that's what teeth are made out of."

Okay.

(I see the boy has a promising future in dentistry!)