I'm not sure if everyone with a merc problem has/had a mouthful of amalgam...I had 4 which isn't that many. Could just have developed a hyper-sensitivity to it for various reasons.
Yes that's true about Mineral Check...really hair tests should be done through a practitioner who can look at other things too. MCheck told me that once you get the metabolism right (based on their dietary advice) any metal problems will sort themselves out but I doubt whether that's true.