This thread prompted me to do some googling, and I found that dental amalgam (not eating fish, or anything else) is the largest source of exposure to mercury in the general population. So why are we warned to limit consumption of fish, but not worry about amalgam? Something is "fishy" about that prioritization.
I think they are trying to cover their butts. They don't dare admit the dangers for fear of lawsuits.
When I was looking for a new dentist I did ask about amalgams. Whether they offered it or not. Most of the dentists I asked, don't even offer it anymore. I asked because at the time I was concerned that they were just trying to make money off people by replacing all their amalgams with the white filling.
We seem to have a good dentist now, but we went through several 'bad' ones to get there.