They're actually the longest teeth in the human mouth. So what are these long, sharp teeth doing among our short, stubby ones? Well, contrary to popular belief, it's not for tearing and ripping meat.

Teeth are the hardest substance in the human body—even harder than bones—making ... Minerals make bones hard and strong, while collagen provides flexibility and helps bones resist breaking.

Now, according to a study published in the journal Stem Cells Translational Medicine, researchers have shown it’s possible to cultivate lab-grown human teeth cells inside of a pig’s mouth.