Anonymous
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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.
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Chewing Aluminum Foil
Anonymous
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Afton
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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.