The full coverage bridge is a very strong option of holding onto the neighbours with crowns that cover the entire tooth. This option is good for broken down teeth, where support is needed to reconstruct the teeth either side of the gap. Bridges may have a metal substructure with porcelain on top, or they can be entirely made of white zirconia. They look very similar to natural teeth. As three or more teeth are often joined together, special interdental cleaning brushes are needed to keep the bridge hygienically clean.