I don't know what you people are smoking, but Apple Cider Vinegar doesn't heal canker sores at all, it hurts to use it at first and the relief is only temporary. I actually started to get more Canker Sores from using it. Why do you think an acid is going to help when eating acidic foods is one of the causes?
I tried acv on 3 small canker sores which weren't too painful but bothered me most in the evening. The next morning I got up and they were all bigger and hurt like crazy all day. The acv definately made them worse.
