What's the thickness, or measurement for the last or thickest wire?
some people have just a thin wire that's called a chain(its pretty much any colour you want elastic that stretches from one side to the other), some have a metal chain which is a lot thicker. it all depends on your teeth.
they change your wire according to how much your teeth have shifted around, so it just depends. the ortho needs to adjust the size of the wire due to your teeth straightening out and making sure the wire(s) are at a correct length. its really not that thick of a wire, so don't worry about it. :D
