Thanks for all the tips. I haven't done anything to the wound yet because I have resigned myself to the fact that it will take a while to get better. It is day 3 and so far it still is tender, although not as irritable as day 1. But it is redder, which sucks; and I have spent all day telling people that it is not a symptom of herpes, or something.
To answer SundaySwim's question: The food in question was a circular whole-wheat pita. The circumference was larger than my mouth so the pita touched the edge of my mouth before it touched my tongue - thankfully.
PS I take back every joke I made about that woman who sued Dunkin' Donuts because she burnt herself with the hot coffee.