As you can see... mercury didn't have any thing to do!!! not even the infection of your tooth that by the way you have to do the root canal any way!! because if you already have an infection is because the nerve inside is dead, necrotic, so it will appear the infection again. From my point of view and by the study that I have to be poisoned by mercury the body will need a larger amount of it than the one that you can get from your fillings even f you have amalgams in all your teeth!! but it is obvious that is not healthy to have them!!! In my point of view don't panic that much for mercury in the amalgams!! there might be more mercury in fish than the one you have in your mouth!!