Here the world substance should be read as element of the periodic table. Whether or not mercury is the second most toxic element of the periodic table is debatable, mercury shouldn't be used in dentistry.
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I understand the point you want to make, and you're right. I believe that they have already switched to composite fillings. (though mine are all amalgam)
To me, when I read a post like this that starts with such a highly debatable statement, the post loses the chance to make the impact it deserves. ;)