To prevent tooth decay, it is better for the pH of the mouth to remain above about which value?
Answer and explanation
Correct answer: 5.5
Tooth enamel is mainly mineral and can dissolve when acids lower the pH in the mouth. Oral bacteria may produce acids from sugars, and enamel becomes increasingly vulnerable below the critical pH of about 5.5. Keeping the mouth above approximately 5.5 reduces the risk of demineralisation and tooth decay. The lower values in options B, C and D represent more acidic conditions, so option A is the correct threshold.
Frequently asked questions
What is the correct answer to this question?
5.5
Why is this the correct answer?
Tooth enamel is mainly mineral and can dissolve when acids lower the pH in the mouth. Oral bacteria may produce acids from sugars, and enamel becomes increasingly vulnerable below the critical pH of about 5.5. Keeping the mouth above approximately 5.5 reduces the risk of demineralisation and tooth decay. The lower values in options B, C and D represent more acidic conditions, so option A is the correct threshold.
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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