What Is the Difference Between Secondary Dentin and Tertiary Dentin

What is the difference between secondary dentin and tertiary dentin?

A) Secondary dentin forms before the tooth erupts and continues forming during the life of the tooth while tertiary dentin forms after eruption, composing the bulk of the tooth.
B) Secondary dentin forms after the tooth is erupted as a response to irritation, whereas tertiary dentin appears within the wall of the pulp chambers.
C) Tertiary dentin forms as a response to irritation.
D) Secondary dentin forms on the apical half of the root, whereas tertiary dentin does not.

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