Did you bite something hard?
Porridge is the best solution. Usually it's just first time you'll feel slight pain. My friend and I didn't feel any pain at all on the second month. Still, depends on each person. I bite whatever's in front of me, at most, just having loose brackets  (Just go to the dentist and have the dentist to 'glue' them back, FOC). The annoying part is when the food got stuck between the brackets