Im sure I probably had mercury stains in my teeth too - I wonder if what helped was using that Dental Chelat mouthwash before and after the removal. The dentist thought I was a looney toon, but I insisted on not using the flouride rinse, and using the Dental Chelat instead. I bought it online-- it is supposed to chelate out any mercury ions or nano-particles--, the tiniest particles- and you have to spit it right out after swishing it around in your mouth. It also has some herbs added. It can also be used for those who still have metal fillings in thier mouth.

I'm sure that any remaining mercury stain is nothing compared to the clump of metal filling that remains in the untouched tooth.