This is an odd thing. I ate a nice fresh Granny Smith apple yesterday, and right away all my teeth started to ache. Not the kind of sharp deep ache like a real toothache, which comes from inside, but a more superficial aching all over the outside of them. They continued feeling that way for the rest of the evening, and they still feel slightly uncomfortable today.

Why would I get such a reaction from eating one apple? I've eaten thousands of apples in the past however many years, and usually I don't get such a reaction. I can only assume it was very acidic, and the acid reacted with my teeth somehow, but why would it?

Anyone else experienced this?