Well this is a new one for me. I have suffered tounge burn and tounge bite before on more than one occasion. Sore for a few days, biotene, etc. Generally goes away easily. This time, entire tounge is black, yes black, almost the whole top section!!! The only thing i done different was had a couple pipes of penzance. I really cant figure it out. Tounge is sore, and black and roof of mouth is sore. This is going on 4 days now. Got any opinions???