Did you know what the ancient Romans used to align teeth?

They say that they used gold, but some of them actually used a little thin gold wire, but most of them actually used something called catgut! 
 
What catgut is, it's sheep and goat intestines, ew... they used it because it was a really strong material and it can actually straighten the teeth. So next time you're at your orthodontist and you don't like the wires, be happy it's not catgut...