Your saliva creates an electrical current for the two metals to react. It gives you a small zap of pain which is known as a galvanic shock.
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My wife can chew on aluminum foil with no galvanic shock sensation. : r/mildlyinteresting
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My wife can chew on aluminum foil with no galvanic shock sensation. : r/mildlyinteresting
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Why does putting aluminium foil in the mouth cause pain? - Quora
My wife can chew on aluminum foil with no galvanic shock sensation. : r/mildlyinteresting