Why does touching tinfoil with your teeth, especially when you have fillings, hurt so much?
In: Other
This is called [Galvanic corrosion ](https://en.m.wikipedia.org/wiki/Galvanic_corrosion)
The two metals (the aluminum foil and the amalgam filling) have different electric potentials, and in the presence of an electrolyte (ie saliva) a current is generated
Latest Answers