A crown is typically needed when a tooth has a cavity or fracture that involves half the width of the tooth or more. The crown fits over the healthy part of the existing tooth up to the gum line or margin (edges) of the crown.
Crowns do prevent cavities on the surface of the tooth; however decay can occur at the margin and spread to the existing tooth under the crown. If this happens, the crown will need to be replaced and the decayed portions of the tooth removed. If left untreated, it is possible to lose the tooth.
The best way to prevent a cavity from forming under a crown is to pay special attention to brushing and flossing, especially around the margin of the crown. The hygienists at Lakeshore Dental would be happy to demonstrate proper cleaning around your crown.
If you have any problems with your crown, contact us to schedule an exam.