I had braces and it didn't hurt 或者 something. So, don't be nervous is my advice. Just lay down and don't 移动 so much, than every thing's gonna be alright, believe me! (: And later 你 have very nice teeth!!! ;D
thay are hang on my teeth since like 3 years till now. i like it tho. its so "IN" in my country right now. its rather like a cute thingy for everyone. and it doesnt hurt at all. *only like for 3 days at the beggining. :)