Fillings are the most common of the dental restorations. Often used in the treatment of cavities; the rotten section of the tooth is removed and the residual hole is filled with a gold, silver amalgam, or composite resin. Not only restricted to treating tooth decay, fillings may also be used to repair cracked and broken teeth. Silver amalgam is commonly used fill cavities, however; composite fillings are beginning to become more in fashion now due to the natural tooth colour.