Why do my teeth hurt when I chew aluminum foil?

I'm a dentist.

It's a process called galvanization. It occurs when you have silver fillings.

Basically, the aluminum foil and the amalgam, when surrounded by your saliva, develop an electric potential between eachother and current passes between them. It's a process very much like a battery.

Chewing Aluminum Foil

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RE:

Why do my teeth hurt when I chew aluminum foil?

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If you have no fillings it won't. It is only when it comes into contact with metal based fillings you will have problems as it sets up a galvanic cell in your mouth and produces electricity.

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The aluminum foil is reacting with your fillings. The saliva and the two dissimilar metals are actually making a little battery and the minute amount of electrical current generated are apparently enough to shock you.

FOr a supercharged version of the same thing, touch the tip of your tongue to the terminals of a 9-volt battery. Pretty similar, but on a large scale, isn't it?

First off do you have fillings? if you do then the metal from the aluminum & the metal in your tooth will have a strange reaction with eachother. I've tried that before too and it kills.

because it makes ur teeth bleed and it hurts

that's your teeth's way of telling you to stop chewing aluminum foil.