Community dentistry: climate and optimal fluoride level: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Community dentistry: climate and optimal fluoride level

Sample item

Why is the recommended optimal fluoride concentration in drinking water set lower in hot regions than in cool ones?

APeople drink more water, so fluoride intake risesBFluoride evaporates faster from water in hot weatherCSweating removes more fluoride from the bodyDEnamel dissolves more readily in a hot climate

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. People drink more water, so fluoride intake rises

Water intake rises with temperature, so the same concentration delivers more fluoride per person in a hot climate. The optimal level is therefore adjusted downwards, to prevent fluorosis while retaining the caries benefit. This is why a single concentration is not applied everywhere.

Option by option

A. People drink more water, so fluoride intake rises (correct)
Correct. Greater water consumption increases the daily fluoride dose.
B. Fluoride evaporates faster from water in hot weather
Fluoride is a stable ion that does not evaporate in appreciable amounts.
C. Sweating removes more fluoride from the body
Sweat loss does not account for the adjustment in recommended concentration.
D. Enamel dissolves more readily in a hot climate
Climate does not alter enamel solubility in this manner.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, People drink more water, so fluoride intake rises. Water intake rises with temperature, so the same concentration delivers more fluoride per person in a hot climate.

Why is "Fluoride evaporates faster from water in hot weather" not the answer?

Fluoride is a stable ion that does not evaporate in appreciable amounts.

Why is "Sweating removes more fluoride from the body" not the answer?

Sweat loss does not account for the adjustment in recommended concentration.

Why is "Enamel dissolves more readily in a hot climate" not the answer?

Climate does not alter enamel solubility in this manner.

What concept does this question test?

It tests Community dentistry: climate and optimal fluoride level in Dentistry. The optimal level is therefore adjusted downwards, to prevent fluorosis while retaining the caries benefit. This is why a single concentration is not applied everywhere.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Community dentistry: climate and optimal fluoride level?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.