To protect tooth enamel from dissolving, it is better to keep mouth pH above which limit?
Answer and explanation
Correct answer: About 5.5
The governing concept is acid attack on tooth enamel. Enamel is mainly a calcium-containing mineral, and acids can dissolve it when the mouth becomes sufficiently acidic. In school-level chemistry, the commonly cited critical pH is about 5.5; below this value, demineralisation of enamel becomes more likely and repeated exposure can contribute to tooth decay. Therefore the mouth should preferably remain above about 5.5, making option B correct. The other values are far more acidic and would not provide protection.
Frequently asked questions
What is the correct answer to this question?
About 5.5
Why is this the correct answer?
The governing concept is acid attack on tooth enamel. Enamel is mainly a calcium-containing mineral, and acids can dissolve it when the mouth becomes sufficiently acidic. In school-level chemistry, the commonly cited critical pH is about 5.5; below this value, demineralisation of enamel becomes more likely and repeated exposure can contribute to tooth decay. Therefore the mouth should preferably remain above about 5.5, making option B correct. The other values are far more acidic and would not provide protection.
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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