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Dentist: I recommend brushing one’s teeth after every meal to remove ... ...

Dentist: I recommend brushing one’s teeth after every meal to remove sugars that facilitate the growth of certain bacteria; these bacteria produce acid that dissolves minerals in tooth enamel, resulting in cavities. And when brushing is not practical, I recommend chewing gum—even gum that contains sugar—to prevent the formation of cavities.

Which one of the following, if true, would most help to reconcile the dentist’s apparently paradoxical recommendations?

(A) A piece of chewing gum that contains sugar contains far less sugar than does the average meal.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT72 (Jun 2014): Logical Reasoning B

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