As you may have already noticed, if you bite aluminum foil, the strange sensation of heat or pain in your teeth is quite unpleasant. This is due to the contact between the aluminum and the metals that make up the fillings in some teeth. If you feel a tingling sensation when biting aluminum foil, it is because some of your teeth have been provided with fillings. In this case, the connection between the aluminum and the elements of the filling causes a reaction similar to that of a battery.
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