I know someone who's got a catalogue of health problems caused by mercury poisoning due to being a former dental nurse over-exposed to mercury vapours. I have white fillings, but I am nervous about the components of those as I've heard they sometimes have BPA in them, which is a hormone disruptor with a different load of problems. And it's not often you get long enough with a dentist to get a list of ingredients to make an informed decision.

My husband's dentists warns against white fillings, arguing that mercury is stronger, but mine is still in place and functional.