After Dr. Cothern removes the decay from a cavity, she will need to restore the structure of your tooth with a filling. This filling will also protect the interior of your tooth structure by keeping decay from reforming in the area and worsening the damage. In the past, a silver amalgam material was the material of choice for a dental filling. This material is durable and can be molded to take on the precise shape of your tooth; however, it is easy to see when you speak or smile. Now, you can opt for tooth-colored fillings that are made from a durable porcelain-based resin.