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Tooth decay

Healthy tooth showing layers of enamel, dentin, and root, and unhealthy tooth with plaque showing cavity affecting layers of tooth.

Tooth decay is damage to the enamel of your teeth. It can lead to a hole in the tooth, called a cavity. Cavities can affect the deeper layers of the tooth.

Current as of: May 1, 2026

Author: WebMD Ignite Staff
Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

Clinical Review Board
All WebMD Ignite education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. WebMD Ignite, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.