Fixed bridges are held by teeth on both sides of the area where a natural tooth or teeth are missing. After these supporting teeth are prepared for crowns, a ‘bridge’ (a replacement tooth or teeth) is affixed to the crowns, restoring appearance and chewing ability. In some instances, bordering teeth can serve as anchors for a bridge without crowns. In this option, replacement teeth or a bridge are held by adjacent teeth with metal brackets. Because the brackets are attached to the back of the natural teeth, they are typically not visible.