I had awful teeth, multiple spacers to widen my jaw. I had tooth that didn't want to come down on its own, was stuck up in my sinus cavity so they had to surgically go in and attach a chain to it, then attach that chain to my braces. They would shorten that chain each time I went to the orthodontist so that it slowly pulled that tooth into a normal position. I can't even tell you how many teeth I had pulled just so that I would have enough space in my mouth for other teeth. Lots and lots of extractions, braces, spacers, weird chains, weird bands. Took a while but they got it all together. And now my teeth are starting to become crooked again. Sigh. Bottom worse than the top. Need braces again, but don't want right now. I will probably do it in the next couple of years.