What is there to think about? Since you have only two mercury fillings, getting them replaced is easy! I had mercury fillings in 24 of my teeth! Getting my mercury filling fillings replaced is a big ordeal. 15 of those fillings were huge. I have already had 12 huge fillings removed. If your fillings are large, and especially if they are in rear teeth, you should consider getting them replaced with porcelain inlays or onlays. They cost much more than composite fillings, but last much longer. For smaller fillings, composites are fine. If you are still eating refined sugar, I suggest that you give it up. Eating candy and chocolate is probably what gave me so many cavities. I eliminated refined sugar over 20 years ago. Also avoid sticky dried fruit such as raisins and dates. Potato chips can lead to cavities, so they also should be avoided. Almost all of my mercury fillings were placed over 20 years ago, when I was between the ages of 5? and 25.