When I was much younger, I had braces for about a week. I basically stopped eating and was a holy terror for my parents because I hurt enough that I was angry all the time. About 4 days into them, I got fed up and grabbed a set of needle-nose pliers and ripped the damn wires out of the brackets. Thank heaven that bastard of an orthodontist didn't fit the palate expander in the first fitting; I don't want to think what I would have done to get one of those things off.
Parents relented and decided that it wasn't worth the hastle of dealing with me and they had the doctor take the braces off.
Fast-forward to my Sr. year of HS when I got my wisdom teeth. They pushed everything _into_ alignment and corrected every functional problem the braces were supposed to fix. I absolutely loved my dentist's reaction, "You know, if you'd have gotten braces when you were younger, we'd have had to pull your wisdom teeth because they'd have messed everything up. Just letting everything mature on its own worked out best."
Needless to say, I don't believe in braces for cosmetic reasons at all, and I don't believe in them for minor functional issues in children. Now, something severe or in an adult, sure, go for it if you want, but otherwise I am firmly of the belief that braces are nothing more than a device concocted for bilking honest people out of their money.
ZV