A bridge is a fixed solution to filling the gaps made by losing teeth. The usual type of bridge is made by putting crowns on the teeth at either side of the space, and then joining these two crowns together by placing a false tooth in the space.
This is all made in the laboratory and then cemented into place with special adhesives. The bridge cannot be removed for cleaning.
Another option is an adhesive or "Maryland" bridge. This has wings that are bonded to the back of the supporting teeth with very little drilling involved.
Bridges are usually made of porcelain bonded to precious metal. Sometimes, there are other non-precious metals used in the base for strength. There are also new bridges made entirely of a special type of strong porcelain.