sometimes one has to augment knowledge for a considered personal opinion by reading between the lines of dogma and also drawing upon seemingly disparate facts

so add :

I seem the recall that 50% is mercury metal

waste amalgam can not be dumped into the environment - your little filling is to dangerous for the vast wild ecology

Older sharks can not be legally sold for human consumption due to accumulated mercury toxicity .

Tuna fish are not to be eating in great quantities due to the same reason

A device called the jorome meter can indicate mercury vapour in  a persons mouth - results not encouraging 

Further reading : research papers as listed

http://amalgam.org/education/scientific-evidenceresearch/results-removal-amalgam-fillings/

Just that personally I would prefer to take my chances with synthetic fillings rather than heavy metals

Amalgam safe!!!!!!!!  WTH!

Mercury is a TOXIC metal!!!!!!!!!!

Even the French dentists that invented the stuff/procedure issued grave cautions about it's use!

Dentists should know better! After all, didn't they go to medical school?

One would expect they learnt about poisons.

If a dentists tosses an amalgam filling or ANY part of it in the trash, they are liable for large fines for polluting the environment.

What about polluting someones body for the rest of their life?