I saw the picturs. If you don't think about it, it kind of looks like mother-of-pearl.
I guess in those days they didn't do the whole tooth fairy thing.
And as for the animal teeth, it's a bit odd to see so many of them at one time, but nowadays they're still selling shark tooth neckaces. (Granted, they've been fossilized, but it's still a tooth from a shark.)
And, um, you don't kill a shark to get the tooth. Sharks have several rows of teeth that are constantly being replaced.