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4 votes
Too much fluoride can cause

Brown stains on teeth
Hyponatremia
Obesity
BeriBeri

User Liango
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2 Answers

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Your teeth may develop white or brown spots due to the condition known as fluorosis. Fluoride overexposure throughout the early years of life, when your permanent teeth are forming, is the root cause of this condition.
User Sanela
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1 vote

Brown stains on teeth

User Shardendu
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