A dental crown (also called a cap) is a custom-made covering that fits over the entire visible part of a tooth — from the gum line up. The tooth is filed down to create space for the crown, impressions are taken, and a lab fabricates a permanent cap to match your bite and the shade of your surrounding teeth. Once cemented, it is fixed — not removable like a denture.
Teeth can be damaged in ways that make them too weak to function safely without coverage. A large cavity that has destroyed most of the tooth structure, a crack that runs through the cusp, a tooth that has been root-canal-treated (which becomes brittle and fracture-prone), or a dental implant — all of these require the protection that only a full crown provides. A filling in these situations would eventually fail, often catastrophically, splitting the tooth beyond repair.
The challenge with crowns is that the procedure is irreversible. Filing the tooth down permanently sacrifices healthy tooth structure. This makes it critical to confirm the crown is actually necessary before committing. Many patients are recommended crowns for teeth that have enough intact structure to be restored with a well-made filling, onlay, or inlay — conservative options that are never offered by clinics that prioritise revenue.