A crown is a hollow artificial tooth used to cover a damaged or decayed tooth. The crown restores the tooth and protects it from further damage. Crowns can also be used to cover discolored or deformed teeth. The appearance and function of a tooth covered with a crown are very similar to those of a natural tooth. The bridge, also called “fixed bridge” or “fixed dental prosthesis” is a dental restoration that replaces one or more missing teeth. It is usually formed of an artificial tooth fixed between 2 crowns and extends from one end to the other of the edentulous zone. The bridge is firmly Held in place by your teeth on either side of the missing teeth (s) or by dental implants. It is permanently attached and can not be removed.