Dental fillings are a way to repair teeth which have been damaged due to decay. Cavities may occur for several reasons. It is a best practice to visit your dentist and schedule regular check-ups to test whether a cavity is present. If a cavity is found, it is best to treat it early so that the tooth does not continue to deteriorate. Getting your cavities filled will prevent further bacteria and decay. If left untreated, a tooth may require additional treatment in the form of root canal therapy or even a full removal of the tooth. There are several materials that can be used for fillings including gold inlays, plastic and composite resins, and porcelain. Your dentist will discuss treatment options with you.