Below which pH can tooth decay start more easily?
Answer and explanation
Correct answer: 5.5 / Five point five
Tooth enamel is mainly mineral-based and can be attacked when the mouth becomes sufficiently acidic. The commonly taught critical pH for enamel is about 5.5; below this value, demineralisation and tooth decay can begin more readily. Thus option A is correct. pH 7 is neutral, while pH 10 and pH 14 are alkaline and do not represent the acidic threshold asked here.
Frequently asked questions
What is the correct answer to this question?
5.5 / Five point five
Why is this the correct answer?
Tooth enamel is mainly mineral-based and can be attacked when the mouth becomes sufficiently acidic. The commonly taught critical pH for enamel is about 5.5; below this value, demineralisation and tooth decay can begin more readily. Thus option A is correct. pH 7 is neutral, while pH 10 and pH 14 are alkaline and do not represent the acidic threshold asked here.
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.
