Discolored fillings, small areas of decay, and small chips in teeth can be easily repaired/replaced. We eliminated using silver filling materials well over 10 years ago as the tooth-colored filling material of choice due to its beauty and its ability to bond to the remaining tooth structure which strengthens it.  While we do not advocate removing old fillings for health reasons, we are replacing a  lot of fillings to help make the teeth look like teeth again.  These procedures are done in one visit and the change is dramatic.  See the case below where we removed some decay in the front tooth, and made the filling look indistinguishable from all the others.