Fluride pollution initially affects

Options

A. kidneys
B. teeth
C. heart
D. brain.

Explanation

### Step-by-Step Solution:

1. **Understanding Fluoride Pollution**: Fluoride pollution occurs due to the release of fluoride compounds during industrial processes, particularly in the refining of minerals.

2. **Identifying the Effects**: Fluoride has several health implications. It can lead to a condition known as fluorosis, which primarily affects the teeth and bones.

3. **Analyzing the Options**: The question provides four options: kidneys, teeth, heart, and brain. We need to determine which of these is initially affected by fluoride pollution.

4. **Effects on Teeth**: Fluoride is well-known for its impact on dental health. High levels of fluoride can lead to mottling of teeth, which is a sign of dental fluorosis. This condition results in discoloration and damage to the enamel of the teeth.

5. **Other Health Implications**: While fluoride can affect bones and lead to conditions such as abnormal calcification, the initial and most direct effect of fluoride pollution is observed in the teeth rather than in other organs like the kidneys, heart, or brain.

6. **Conclusion**: Based on the analysis, the most appropriate answer to the question "Fluoride pollution initially affects" is **teeth**.

### Final Answer:
Fluoride pollution initially affects **teeth**.

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