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When you bite aluminum foil, the combination of silver amalgam fillings, saliva loaded with electrolytes, and the aluminum creates a small electrical charge, not unlike the charge you would feel if you were to put your tongue on both terminals of a 9-volt battery. The difference is that this charge is much closer to the nerve of the tooth, which is stimulated and can only signal pain.
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∙ 15y ago
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Why do teeth hurt when you bite foil?
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I've ALWAYS wondered the SAME thing! I finally did some research and discovered that, The pain you feel when you bite into aluminum foil is, A electrical charge. When you bite into it, The "charge" shoots up through your filling, Into the tooth nerve; Which sends signals to your brain to cause pain.
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