BG123, no idea. Some people may still be so toxic, that the use of DMSA/DMPS is a must, and helps. Those with a more light burden of mercury may not need to touch them at all (like me). If you just had one or two fillings i'd advise against using them, it's still quite expensive, and there are some harmful effects that come with their usage (like chelating out important minerals).

Having only a few fillings does not mean that you couldn't suffer from severe depression and have lots of pathogens that need to be addressed. It really depends, we are all different. In the end everyone suffering from mercury poisoning still needs to address pathogens in a way or another.