Tooth decay generally starts when the pH falls below which value?
Answer and explanation
Correct answer: 5.5
Tooth enamel is mainly a mineral containing calcium compounds. Acids produced by bacteria from sugars lower the pH in dental plaque. When the pH falls below approximately 5.5, enamel begins to dissolve more readily, increasing the risk of tooth decay. Thus option C, 5.5, is correct. A pH of 7 is neutral, while 10.5 and 14 are alkaline and do not represent the acidic condition that damages enamel.
Frequently asked questions
What is the correct answer to this question?
5.5
Why is this the correct answer?
Tooth enamel is mainly a mineral containing calcium compounds. Acids produced by bacteria from sugars lower the pH in dental plaque. When the pH falls below approximately 5.5, enamel begins to dissolve more readily, increasing the risk of tooth decay. Thus option C, 5.5, is correct. A pH of 7 is neutral, while 10.5 and 14 are alkaline and do not represent the acidic condition that damages 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.
