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Assertion (A) : Reduction in bicarbonate...

Assertion (A) : Reduction in bicarbonate levels leads of dissolving of tooth enamel.
Reason ("R") " : Bicarbonates in the saliva make the pH 5.4 to 7.4 . If the bicarbonates level in saliva is reduced the saliva becomes acidic and the tooth enamel may get dissolved .

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