Final answer:
Primary teeth have smaller pulps in relation to crown size, a greater thickness of dentin, and more prominent cervical constriction compared to permanent teeth.
Step-by-step explanation:
Primary teeth, also known as baby teeth, differ from permanent teeth in several ways. One key difference is that primary teeth have pulps that are smaller in relation to crown size compared to permanent teeth. The pulp is the innermost part of the tooth that contains blood vessels, connective tissue, and nerves. Additionally, primary teeth have a greater thickness of dentin compared to permanent teeth. Dentin is a bone-like tissue that surrounds the pulp cavity of the tooth. Lastly, primary teeth have more prominent cervical constriction. This refers to the narrowing of the tooth at the gum line.