What is the main process behind the decrease in pH during tooth decay?
Answer and explanation
Correct answer: Mouth bacteria make acids from sugar
Dental plaque contains bacteria that metabolise sugars left on the teeth. During this process they produce organic acids. The added hydrogen ions lower the pH at the tooth surface. If the pH remains sufficiently low, minerals dissolve from enamel and decay can begin. Hence option A is correct. Teeth do not manufacture bases, water does not become hydrogen gas, and toothpaste is generally used to help reduce acidity rather than increase it.
Frequently asked questions
What is the correct answer to this question?
Mouth bacteria make acids from sugar
Why is this the correct answer?
Dental plaque contains bacteria that metabolise sugars left on the teeth. During this process they produce organic acids. The added hydrogen ions lower the pH at the tooth surface. If the pH remains sufficiently low, minerals dissolve from enamel and decay can begin. Hence option A is correct. Teeth do not manufacture bases, water does not become hydrogen gas, and toothpaste is generally used to help reduce acidity rather than increase it.
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.
