Composite, resin, or white fillings are preferred by most patients over the traditional amalgam (silver fillings) for many reasons. When it comes to their mercury content, amalgam fillings have for years been the center of controversy. On rare occasions, some people have even had allergic reactions to these fillings; with composite resin fillings there are no metallic elements.
Composite fillings are a mixture of glass or quartz filler in a resin medium that produces a tooth-coloured filling. This type of filling provides good durability and resistance to fracture in small to mid-sized restorations that need to withstand moderate chewing pressure. Less tooth structure is removed when the dentist prepares the tooth and this may result in a smaller filling than that of an amalgam. Composite fillings are very aesthetic and virtually blend in with the tooth.