The presence of soluble fluoride ions upto $1 ppm$ in drinking water is:

Harmful for teeth

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Harmful for skin

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Harmful for bones

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Safe for teeth

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Solution

The correct option is D Safe for teeth
The presence of soluble fluoride ions upto $1 ppm$ in drinking water is safe for teeth.
If the fluoride ions are more than $2 ppm$ then it is harmful for the teeth.
Fluorinated teeth
So, option d is the correct answer.

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