I felt so sick the days after my first three replacement sessions. After that though I started getting gum infections soon after a removal session. I think it was probably candida. The last few times I was prepared, and took antifungals before and for many days after the removal session. The gum infections still occured, but they were much less severe. I think that taking antifungals before and for at least a few weeks after amalgam replacement is a prudent move.