I don't know yet, truth be told.
I only got my braces nearly one month ago. When it's going to be tightened, it will be one month.
The first week hurts, my gums felt really tender and the metal was sticking uncomfortably but I got used to it now. And when I tried to bite my teeth together, pain just shooted up and I could only eat porridge and soups...TT^TT
But it's not hurting right now, just like before I got my braces. From what I've heard from (by my friends) they said it hurts a lot :/