Getting braces for crooked teeth is one of our society's accepted forms of self torture for the sake of vanity. It's completely painful and done in a terribly awkward stage in life but it's worth it in the end, not just for the sight of straight teeth but for the pure functionality of improving the bite (or so they say). Here's the entire process.
It's pretty amazing what tugging your teeth with metal wires can do. This video shows an 11-year-old girls braces over the span of 18 months.