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Name:  ranger
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1993

Can any one tell me why we get like electric shocks or whatever when we chew on a piece of aluminum foil (with silver fillings in a couple of teeth)?

That is exactly what you electric shock. The filling is made of an amalgam of mercury and either tin or silver. When the aluminum foil touches the filling, a galvanic cell is created in the mouth. Aluminum is the anode, the filling is the cathode and the saliva is the electrolyte 'salt bridge.' The contact essentially short circuits the cell and a small amount of current flows which is sensed by the nerves in the teeth. There is the pain you feel.

Joe Schultz

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