I had a brace and a spacer once, and it could be just the person its on because some people get hurt or soar easier. When i got a spacer it only hurt for the first or second day but then it stopped. But like i said it depends on the person.
Well I have braces now >.< but, I get them off around Nov.!!! Anyways for a while I had like 4 friggin spacers haha anyways mine only hurt for like 4 days tops. I just got my braces tightened monday and they are just now feeling better because they gave me the biggest wire available. Good luck, sorry braces suck.