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RE: Tin Foil Question - 8/27/2005 7:52:20 AM

stef

Posts: 10215
Joined: 1/26/2004
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quote:

ORIGINAL: ElektraUkM

Isn't tin foil on tooth fillings meant to be painful? Or is that a myth?

I'm sure it wasn't meant to be that way, it's just science.

It's called the Voltaic Effect. Any time you have two dissimilar metals in contact in a conductive environment (moist and salty like the inside of your mouth, is a perfect example) you create a tiny Voltaic Pile, or a simple battery. Due to the difference in electrochemical potential of the dissimilar metals, there is a flow of electrons from one to the other which hits the nerve in your tooth and your brain interprets that signal as pain.

~stef

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(in reply to ElektraUkM)