Why does touching tinfoil with your teeth, especially when you have fillings, hurt so much?
In: Other
When your metal fillings meet tin foil, the body’s weak electrical impulses create a closed circuit and you have essentially form a weak battery. Remove the foil and it stops. You aren’t electrocuted but you will feel a slight buzzing. Your fillings must be pretty close to the nerve in your tooth so that would explain the hurt.
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