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Subjects
Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsEasyLevel 1

Tooth decay may begin when the pH falls below which value?

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Answer and explanation

Correct answer: 5.5

Acids produced by bacteria in the mouth can affect tooth enamel. When the pH falls below 5.5, demineralisation of enamel may begin, increasing the risk of tooth decay. A pH of 7 is neutral, whereas a pH below 5.5 is sufficiently acidic to harm enamel.

Tags

scienceclass 10acids bases saltsphtooth decayenamel

Frequently asked questions

What is the correct answer to this question?

5.5

Why is this the correct answer?

Acids produced by bacteria in the mouth can affect tooth enamel. When the pH falls below 5.5, demineralisation of enamel may begin, increasing the risk of tooth decay. A pH of 7 is neutral, whereas a pH below 5.5 is sufficiently acidic to harm enamel.

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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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
  4. 4What is the general nature of an aqueous soap solution?
  5. 5Which of the following substances turns red litmus paper blue?
  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
  9. 9Which gas is generally produced when dilute acids react with active metals?
  10. 10A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?
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