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The primary composition of teeth is predominantly dentin, which is the layer found beneath the enamel and cementum. Dentin is a hard, dense tissue that makes up the bulk of a tooth, providing it with structure and strength. It contains tiny microscopic tubules that can transmit stimuli, which are important for the sensitivity of teeth.

While enamel, which is the hardest substance in the human body, covers the outer surface of teeth and protects against decay, it is actually much thinner compared to the volume of dentin. Cementum also plays a role in anchoring teeth to the jawbone but does not make up the primary bulk of the tooth structure. The pulp is the innermost part of the tooth, containing nerves and blood vessels, but it is not the main component in terms of actual tooth structure. Therefore, dentin is recognized as the primary composition of teeth due to its prevalence and structural significance.