Please take care when replacing amalgam dental fillings.
The first problem, of course, is that there has never been any proof that amalgam fillings cause these so-called “metal toxicity” problems. There’s even less proof that removing amalgam fillings results in any improvement – other than, of course, the placebo effect that’s caused by the patient’s belief in undergoing such a thing.
The second problem is that amalgam fillings are often replaced with composite fillings. These composite fillings contain BPA’s – which were once used in food containers and plastic bottles, but have since been forbidden because BPA’s leek into the food/drink, and they are quite poisonous. Therefore, replacing your amalgam fillings with composite fillings might well worsen the problem.