A cavity filling is never fun. A filling is a material that your dentist uses to fill a cavity after he or she removes any tooth decay. If your dentist tells you that you have a cavity, you will need to have the tooth filled. Although you have a few options to choose from related to the type of material used to fill the tooth, you should not avoid having the tooth filled because doing so can lead to further decay and damage. There are a number of dental filling material options available these days. In addition to the traditional silver amalgam fillings, which are becoming less popular due to their looks and the fact that they include mercury, you can opt for composite fillings or ceramic fillings. Composite fillings are becoming one of the most popular dental filling options, since they match the natural color of your teeth. Ceramic, or porcelain, fillings also match natural tooth coloring, but can be abrasive if they hit up against natural teeth. Gold fillings are also still available but are not a very popular choice.