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Another wierd question...Why does chewing aluminum foil hurt your teeth?
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It should only hurt your teeth if you have a certain kind of fillings. The filling material reacts with the aluminum, causing pain.
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?