Bridges are similar to crowns and do all the functions of a crown plus they also replace missing teeth. A bridge is basically two crowns connected by a "dummy" tooth (teeth) that replaces the missing tooth (teeth). The bridge helps prevent the teeth from drifting and tilting into the space opened up by the missing tooth. This tends to create an uneven bite, difficult areas to clean and sensitivity due to the exposure of the root surface to the oral environment.