Below which pH does the risk of tooth decay increase?
Answer and explanation
Correct answer: About 5.5
Tooth enamel is mainly mineral matter and can be damaged when the mouth becomes sufficiently acidic. Bacteria use food sugars and produce acids, lowering the pH around the teeth. When the pH falls below about 5.5, enamel dissolution becomes more likely and the risk of dental decay rises. A pH of 7 is neutral, while 10 and 14 are alkaline, so they do not represent the critical acidic limit asked here.
Frequently asked questions
What is the correct answer to this question?
About 5.5
Why is this the correct answer?
Tooth enamel is mainly mineral matter and can be damaged when the mouth becomes sufficiently acidic. Bacteria use food sugars and produce acids, lowering the pH around the teeth. When the pH falls below about 5.5, enamel dissolution becomes more likely and the risk of dental decay rises. A pH of 7 is neutral, while 10 and 14 are alkaline, so they do not represent the critical acidic limit 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.
