A bridge is a restoration which replaces the space where one or more teeth have been lost. Fixed bridges are cemented into place and can only be removed by a dentist. Bridges are made from gold alloys, porcelain, or a combination of these materials. A bridge helps maintain the natural shape of your face and may help support your lips and cheeks. Missing teeth can affect the way you chew and speak. The loss of a back tooth may cause your mouth to sink and your face to look older.