When a tooth can no longer be restored with a filling due to catastrophic loss of tooth structure, a crown restoration may be the treatment of choice.
To replace missing teeth, sometimes crowns are placed on the adjacent teeth next to the space and those crowns are connected with the missing units to be replaced, thereby forming a bridge over the area.
Crowns and bridges are cemented permanently in the mouth, are not intended for removal, and are considered fixed (non-removable) solutions.