Yes, wait to see what happen, it is not recomended to take more of it, as it can do only bad, either a prooving, or it slows down its action.Works about a mont, dont do anything if old symptomes, diseases reocures during this time, it show that the remedy works.It goes away by it self, new unrelated symptome to the picture, tells that the remedy is either wrong, or that somthing new is going on, that needs a new remedy.
As for antidotes of mercury, well, when drilling out those fillings, the dentist should use a cofferdam, and a heavy vacumesuction, and you tkae two charcoaltablets 15 min before this procedure, along with a standard drink of alchahol, it hinders mercury from being taken up in the blood and brain.