Composite Filling MaterialComposite, or tooth-colored, fillings can be used to repair teeth that have been decayed, cracked, or chipped. They are much more aesthetic than amalgam, or silver, fillings and they do not contain any mercury. Composite fillings allow for more conservative fillings to be placed, which means that more natural tooth structure is conserved. As with any dental restorations, composite fillings are not permanent and may someday have to be replaced. They are very durable, and will last many years, giving you a long-lasting, beautiful smile.