Why is a basic toothpaste useful for teeth?
Answer and explanation
Correct answer: It can neutralise acid formed in the mouth
Bacteria in the mouth can break down sugars and produce acids. These acids lower the local pH and may gradually demineralise tooth enamel, causing tooth decay. A mildly basic toothpaste can react with and neutralise some of the excess acid, helping protect the enamel. Thus option A expresses the correct acid-base principle. Toothpaste does not dissolve enamel immediately, convert sugar into acid, or make the mouth’s pH zero; those statements are chemically incorrect.
Frequently asked questions
What is the correct answer to this question?
It can neutralise acid formed in the mouth
Why is this the correct answer?
Bacteria in the mouth can break down sugars and produce acids. These acids lower the local pH and may gradually demineralise tooth enamel, causing tooth decay. A mildly basic toothpaste can react with and neutralise some of the excess acid, helping protect the enamel. Thus option A expresses the correct acid-base principle. Toothpaste does not dissolve enamel immediately, convert sugar into acid, or make the mouth’s pH zero; those statements are chemically incorrect.
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.
