Which best describes a difference between primary (deciduous) teeth and their permanent successors?

Correct answer: C. Primary crowns have greater mesiodistal than inciso-/occluso-gingival dimension

• A. Primary teeth do have relatively large pulp chambers with high horns, but the option as stated is true only in the relative sense; the keyed answer favors the crown-shape descriptor.
• B. Enamel and dentin are thinner in primary teeth, not thicker.
• C. Correct. Primary crowns are squat/bulbous — wider mesiodistally than they are tall — giving the characteristic constricted, bulging-cervical form.
• D. Primary teeth are whiter (more opaque/bluish-white), not darker, than permanent teeth.

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