Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Dentin is the dense, bony tissue that forms the bulk of a tooth beneath the enamel. It contains microscopic tubules that can transmit sensations from the outer surface of the tooth to the nerve inside.
Related terms
Enamel: The hard, protective outer layer of a tooth that covers the dentin.
Pulp: The softer, living inner structure of a tooth containing nerves and blood vessels.
Periodontium: The specialized tissues that surround and support the teeth, including gums and bone