Mercury metal is not toxic!!!  It passes harmlessly through the body.  It is really sort of an inert substance.  I have had many fillings in my mouth  since infancy, and still have an IQ of 140.  I do have mild autism and aspergers, but so did my father, and so does my son (140 IQ and no autism)  As I got older and my fillings were removed and replaced with gold, nothing changed.  

Now I am sure that some people are highly sensitive to mercury and may have problems.  Those are much more likely to be caused by the high levels of atmospheric mercury from coal fired power plants.  

There are exactly zero peer reviewed double blind studies that support the theory that mercury fillings are toxic.  Putting this another way, the believers in this have been inoculated to facts.  They can not or will not learn.   Which is just a long way of saying that they are stupid.