DAT Reading Comprehension Practice Questions - Dental Admission Test - Reading Comprehension Test Exam

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PASSAGE 1 (see Question 1 for full text): According to the passage, why are mature enamel lesions particularly difficult for the body to repair?

Enamel is too dense for remineralizing ions to penetrate The ameloblasts that formed enamel are no longer present after tooth eruption Fluoride concentrations in saliva are too low to replace lost hydroxyapatite Cariogenic bacteria permanently block calcium uptake at the enamel surface

Correct Answer:

The ameloblasts that formed enamel are no longer present after tooth eruption

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