When you get a mouth ulcer, it makes sense that spicy and acidic foods
and drinks will hurt like there's no tomorrow.

However, one of life's little mysteries is that chocolate does that too.
It stings like hell. But why? Chocolate doesn't immediately come to mind
when I try to think of foods that would be especially irritating to a
mouth ulcer. What is it in there that causes so much irritation? Normally
chocolate feels so smooth and soothing, like silk. But to a mouth ulcer
it feels like sulfuric acid.

-- 
                                                          - Warp

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