There are other ways of getting enough exposure to mercury to cause illness. I've heard of people having no amalgams and consuming too much seafood for a long enough time and finally becoming toxic with mercury. And as Linda said, vaccines is another one.

I think the problem are people who tend to retain it, whereas others excrete it pretty well. This is why some people can work around mercury and seem to show no real ill effects, whereas others deteriorate. We had a study in new zealand with dental nurses and what had happened to them later in life. Nearly all of them without fail had most of the same problems, pretty severe too.

A general dentist my father chatted to (young she was) admitted to him privately that since working in dentistry she has suffered in explicable health and mental problems and now admits she may have to get mental help. She seemed fine externally, healthy looking and a great sense of humor, yet privately she admitted she was having these issues. She didn't seem to want to accept that mercury may be the problem, but looked very troubled when he mentioned the possibility...