A bridge is a prosthetic replacement used to substitute for a single tooth or more teeth. It is set so that it anchors and binds to your remaining teeth in the way that both sides of the missing tooth are prepared.
The bridge is cemented on the prepared teeth and bypasses the gap just like a bridge crosses a river or a canyon. For example, a tripartite bridge is made out of three crowns joined together – the two outmost are cemented onto your natural prepared teeth and the one in the middle imitates the missing tooth.