In the past much of the fillings that were used were dental amalgam. While effective, this would create aesthetics problem as it would usually leave a dark gray blotch in your teeth. 

Today, we use a composite resin that can be shaded to perfectly to match the color of your tooth. Today’s modern white filling materials strengthen teeth unlike the mercury amalgam fillings of years past. These new materials restore teeth to their original look, feel, and beauty.