704 Burnhamthorpe Rd. East | Mississauga, ON L4Y 2X3 (905) 567-5768

While most of us are familiar with the outer layer of our teeth, known as enamel, the inner core, called dentin, plays a crucial role in maintaining the strength and integrity of our pearly whites. In this article, we’ll delve into the fascinating world of dentin, exploring its composition, function, and importance in dental health.

What Is Dentin?


Dentin is a hard tissue that forms the bulk of the tooth structure, lying beneath the enamel and surrounding the pulp chamber. It’s composed of mineralized connective tissue and is primarily made up of hydroxyapatite crystals, collagen fibres, and water. Its unique composition gives dentin both strength and flexibility.


It is situated between the enamel and the pulp chamber, and forms most of the tooth’s structure. Enamel, the outermost layer, protects the dentin, while the pulp chamber contains nerves, blood vessels, and connective tissues.


Dentin serves several vital functions within the tooth structure:

  • Support and Structure: Dentin provides structural support to the tooth, ensuring its overall strength and integrity. While enamel is the hardest substance in the body, dentin’s toughness and flexibility make it a crucial component in withstanding the forces of biting and chewing.
  • Sensitivity: Dentin is directly linked to tooth sensitivity. When enamel is compromised due to decay, erosion, or other factors, dentin becomes more exposed, and dentinal tubules and microscopic channels within the dentin connect to the nerve-filled pulp, making the tooth more susceptible to temperature changes and external stimuli.
  • Secondary Defense: In cases where the enamel is breached by decay or physical damage, dentin acts as a secondary line of defence. It can help protect the inner pulp from bacterial invasion and further damage.
  • Dentinogenesis: Dentin is a dynamic tissue capable of continuous growth and repair. Throughout life, the tooth can lay down new dentin in response to various stimuli, such as injury or infection. This process, known as dentinogenesis, helps maintain the health and longevity of the tooth.

Dentin and Dental Health

Tooth Decay

When bacteria breach the enamel and reach the dentin, it can lead to tooth decay. Unlike enamel, dentin is more vulnerable to bacterial acids. Therefore, addressing decay in its early stages is crucial to prevent further damage to the dentin and protect the tooth’s overall health.

Tooth Sensitivity

Exposed dentin can result in tooth sensitivity, causing discomfort or pain in response to hot, cold, sweet, or acidic stimuli. Managing tooth sensitivity often involves addressing the underlying causes, such as enamel erosion, gum recession, or dental treatments.

Dentin may not be as visible as enamel, but its role in maintaining our teeth’ structural integrity and health is invaluable. Understanding the composition and functions of dentin allows us to appreciate the complexity of our dental anatomy. Practicing good oral hygiene, addressing dental issues promptly, and seeking professional dental care are essential steps in preserving the health of both enamel and dentin, ensuring a strong foundation for a lifetime of smiles. Contact us to schedule your dental visit today.