PT155.S1.Q10 > Question

SECTION 1 · lr

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SECTION 2 · lr

SECTION 3 · rc

PASSAGE 1

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PASSAGE 2

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SECTION 4 · lr

The dentist hypothesizes that fluoridated water doesn't significantly prevent tooth decay. She supports this by citing recent studies showing that in Europe, where water isn't fluoridated, the rate of tooth decay in children is lower than in the U.S., where water is fluoridated.

The dentist overlooks other factors, like diet, oral hygiene, or healthcare access, that could affect tooth decay rates. She assumes water fluoridation doesn't prevent decay without considering that decay rates might be different to begin with.

Just because fluoride toothpaste is widely available does not mean that children are using it. (A) doesn’t help to confirm the hypothesis that fluoridated water fails to prevent tooth decay.

Irrelevant— (B) does not imply that fluoride is therefore ineffective at preventing decay. We don’t know whether most children in the U.S. visit the dentist or whether all European dentists also apply fluoride to tooth surfaces.

Like (A), just because dental hygiene is taught in Europe and the U.S. doesn't mean that children then practice it. This doesn’t help to show that the fluoridation of water is the main difference in dental hygiene between American and European children.

This weakens the argument by providing an alternative hypothesis to explain the differing rates of tooth decay. If European children receive more frequent dental care, it makes sense that they also have lower rates of tooth decay.

This strengthens the argument by eliminating an alternative hypothesis. If the diets of children in the United States are not worse for teeth, then diet is unlikely to be the cause of their tooth decay.

PrepTest 155 - Section 1 - Question 10

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