This is kind of gross, but the top of my tongue has a whitish layer on it that comes off if I scrape it with my toothbrush. What is it?? I've never noticed it before, and I only noticed it just before dinner. Does my lunch have anything to do with it? I had Burger King for lunch, and I've been chewing gum all day. Though, my mouth has been feeling funny since I had a couple of packets of salt and vinegar flavoured chips (Ok, I DO eat healthy foods too, but I'm guessing that if what I ate is what caused it, fatty junk food would be the more plausible culprit of the two). Before you ask, yes, I do brush my teeth twice a day, and like I have said, I have never noticed this before.