Getting the braces themselves doesn't hurt much, especially if you get the kind they just glue on, not the bands that go all the way around. However, be prepared for your mouth being sore while you have braces - the whole goal is moving your teeth around, and that's not gonna be painless! That's more of an ache than a sharp pain. It also depends on your teeth - some peoples' teeth are more sensitive than others!

But it is well worth it in the long run, don't worry!