To protect tooth enamel from decay, pH should be prevented from falling below which approximate value?
Answer and explanation
Correct answer: 5.5
Tooth enamel contains calcium phosphate minerals that can be attacked by acids. When the pH in the mouth falls below approximately 5.5, demineralisation of enamel becomes significant and decay may begin. A pH of 7 is neutral but is not the specific critical value asked here; pH 9 and 14 are alkaline. Thus the appropriate answer is 5.5, option A.
Frequently asked questions
What is the correct answer to this question?
5.5
Why is this the correct answer?
Tooth enamel contains calcium phosphate minerals that can be attacked by acids. When the pH in the mouth falls below approximately 5.5, demineralisation of enamel becomes significant and decay may begin. A pH of 7 is neutral but is not the specific critical value asked here; pH 9 and 14 are alkaline. Thus the appropriate answer is 5.5, option A.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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