The al foil reacts with the fluids in your mouth to create
electrochemical effects. The nerves in your teeth are highly sensitive
to such effects.

You can convince yourself of this by placing a very small pellet of al
foil on top of a filling and biting down. Then try it on a tooth with
no filling. In the case of the filling, the al foil combined with the
filling amalgam to create a small battery cell which then sent
electrochemical effects into the filling and eventually to the nerves
in the tooth.

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Govt is an insult to human dignity. With or without govt,
you would have good people doing good things and evil
people doing evil things. But for good people to do evil
things, that takes govt. Govt is the root of all evil.

Does anyone know exactly what causes the weird feeling when chewing
aluminum foil? I have always wondered about this but never could get
an answer. Anyone have a clue? TIA.