Silver fillings, known as amalgam, have been around for decades. They are made from a metal alloy and were, for a long time, the best restoration for fillings. The metal expands and contracts based on the temperature of food and drink you consume. This allowed for little bacteria to enter a tooth once filled; keeping the tooth healthy and strong.White fillings, also known as composites, are made of plastic or glass polymers. These cosmetic fillings allow us to fill a cavity with a substance that will look and feel just like your existing tooth structure. This restoration is created with a resin material and fits tightly into a tooth to prevent decay. Rather than a gray or silver material in your mouth, the composite color will match the tooth color.