Below which pH does the risk of tooth decay increase?
Answer and explanation
Correct answer: About 5.5
Tooth enamel is mainly a mineral containing calcium compounds, and it can be attacked when the mouth becomes sufficiently acidic. Oral bacteria convert sugars into acids, lowering the local pH. When the pH falls below about 5.5, demineralisation of enamel becomes more likely and the risk of tooth decay rises. Therefore option A is correct; pH 7 is neutral, while 10 and 14 are alkaline values.
Frequently asked questions
What is the correct answer to this question?
About 5.5
Why is this the correct answer?
Tooth enamel is mainly a mineral containing calcium compounds, and it can be attacked when the mouth becomes sufficiently acidic. Oral bacteria convert sugars into acids, lowering the local pH. When the pH falls below about 5.5, demineralisation of enamel becomes more likely and the risk of tooth decay rises. Therefore option A is correct; pH 7 is neutral, while 10 and 14 are alkaline values.
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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