The only negative thought I had regarding amalgam removal is this - the dentist digs out the amalgam plus a little more of the tooth, thus increasing the size of the filling. The bigger the filling, the weaker the tooth, which can lead to capped teeth and another vicious cycle.
Mine have been replaced and I'm not sure I've noticed a difference. Mercola says that chlorella will remove the heavy metals such as mercury. http://www.mercola.com/forms/chlorella.htm Cindy