Q4 of 270 Page 79

Why does tooth decay start when the pH of mouth is lower than 5.5?

Tooth decay starts when the pH of the mouth is lower than 5.5. Tooth enamel is made up of calcium phosphate It does not dissolve in water, but is corroded when the pH in the mouth is below 5.5.

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2 What is the common name of water soluble bases? 3 What is common in all the water soluble bases (or alkalis)? 5 What is the pH of a neutral solution? 6 Which is more acidic: a solution of pH = 2 or a solution of pH = 6?