Resin (White) fillings result in a natural-looking smile. The color can be closely matched to your natural teeth, so the restorations are nearly undetectable. Because the resin compound actually bonds to your tooth, the seal is tighter and the restored tooth can be even stronger than it was before.
Composite resin fillings can also be made much smaller than an amalgam filling used to restore the same amount of decayed tooth… so less natural tooth structure is lost.
Teeth restored with white fillings are also less sensitive to hot and cold than teeth restored with amalgam.