i cant wear mouthguards-i tried when i first got braces & i couldnt breathe & spit went everywhere.
i bit my tongue hard enough to make it bleed quite a bit, but never right through (owwwww!)
anyway, suck on ice and/or use a mouthwash with anasthetic. the mouthwash will hurt like a bitch for about 30 seconds bt then ur mouth will go numb.