Tinfoil on fillings...eeeuuu

What causes that terribly unpleasant sensation in my mouth if I touch tinfoil (like a gumwrapper or a piece of foil that as gotton broken off in my baked potato) to my metal fillings? I assume it has to do with metal on metal but how does one’s brain interpret it?
Note: people with perfect teeth need not reply.

I’m the best there is Fats…even if you beat me, I’m still the best.
Paul Newman in the Hustler

it’s caused by a small electric current passing through to the nerve of the tooth. The two different metals have different electrode potentials, hence filling-on-filling produces no effect. The saliva in your mouth acts as an electrolyte.

Better yet, read that answer (and manny, manny more) in “Know It All.”
Edited by Ed Zotti.
Check Cecil Adams House 'O Values.

not to encourge any youngster out there to try, but ocassionally after smoking a joint i get that metal taste in my mouth(around the teeth that happen to have metal fillings) what the hell is THAT about?

so you found a girl who thinks really deep thoughts. what’s so amazing about really deep thoughts? Tori Amos