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What is the ph value of the mouth when tooth decay starts?

मुँह का ph मान कितना होने पर दाँतो का क्षय प्रारंभ हो जाता है?
Anonymous Quiz
ph value less than 5.5 / ph मान 5.5 से कम होने पर
ph value greater than 7.2 / ph मान 7.2 से अधिक होने पर
ph value 6.1 / ph मान 6.1 हो
ph value greater than 6.6 / ph मान 6.6 से अधिक
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