# The largest portion of a tooth is formed by:
A. Enamel
B. Dentin
C. Pulp
D. Cementum
The correct answer is B. Dentin.
Dentin forms the largest portion of the tooth structure, extending almost the full length of the tooth. Externally, dentin is covered by enamel on the anatomic crown and cementum on the anatomic root. Internally, dentin forms the walls of the pulp cavity (pulp chamber and pulp canals).
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