Below which pH does tooth decay become more likely?
Answer and explanation
Correct answer: About 5.5
Tooth enamel is mainly a mineral that can be attacked when the mouth becomes sufficiently acidic. Bacteria metabolise sugars and produce acids, lowering the pH around the teeth. When the pH falls below about 5.5, enamel demineralisation becomes more likely and the risk of tooth decay rises. A pH of 7 is neutral, while 10 and 14 are alkaline. Hence option A is correct.
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 that can be attacked when the mouth becomes sufficiently acidic. Bacteria metabolise sugars and produce acids, lowering the pH around the teeth. When the pH falls below about 5.5, enamel demineralisation becomes more likely and the risk of tooth decay rises. A pH of 7 is neutral, while 10 and 14 are alkaline. Hence option A is correct.
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.
