Dentists call natural looking white fillings "posterior composites". Mercury silver fillings have the disadvantage of being metallic looking and they turn black as they age. If your goal is to create an incredible smile, the dentist will probably use posterior composite restorations as a cosmetic tool to help create an esthetic and beautiful smile for you.
Many
brands of composite white filling materials are approved by The
American Dental Association for use with molar teeth in the back
of the mouth. There is a lot of controversy in their use because
dentists have been trained to use mercury/silver fillings and
change from established ways is often accompanied by controversy.
When possible, however, we feel it's best to use a composite white
filling material since mercury is considered a dangerous substance.
Studies done in Canada showed that sheep given mercury/silver
fillings do get mercury in their body. The argument in the US
is whether it's harmful in man.
White
fillings contain no mercury and once placed into a tooth, they
are often hard to see. They're beautiful. Your dentist can whiten
( bleach ) your teeth and then match the color of your newly whitened
teeth using natural looking white fillings in the back of your
mouth.