For teeth that are badly decayed or broken, crowns are often the best option for people. When cavities and infection go untreated, they can eventually cause enough damage to the structure of a tooth that a regular filling isn't enough to repair the damage.
Teeth that have been fractured as a result of an injury or accident also need to be covered and protected, usually with a crown. A crown covers the entire surface of a damaged tooth and restores it to its original shape and size.