These days, most orthodontists or dentists don't tighten your braces. Most of them just Put in a bigger wire each time you have a checkup. This procedure can hurt the first two days. Not as bad as when you get your braces though.
Sometimes it can hurt a lot, especially if it is your first time getting them tightened. Usually the first time you get them tightened they tighten it a lot...and then the dentist asks you, "Does it...
I am not sure but why would you want braces????? Usually it would be up to your parents and the apperance of your teeth. If you want braces I don't understand that because it's good not to have them...