How does basic toothpaste protect teeth?
Answer and explanation
Correct answer: By neutralising acid formed in the mouth
After food is eaten, bacteria in the mouth may produce acids from sugars. These acids lower the pH and can gradually demineralise tooth enamel. Basic toothpaste contains mildly alkaline substances that react with and neutralise excess acid, helping to keep the mouth less acidic. Hence option A is correct. Dissolving enamel would worsen decay, pH zero is extremely acidic, and increasing acid cannot protect teeth.
Frequently asked questions
What is the correct answer to this question?
By neutralising acid formed in the mouth
Why is this the correct answer?
After food is eaten, bacteria in the mouth may produce acids from sugars. These acids lower the pH and can gradually demineralise tooth enamel. Basic toothpaste contains mildly alkaline substances that react with and neutralise excess acid, helping to keep the mouth less acidic. Hence option A is correct. Dissolving enamel would worsen decay, pH zero is extremely acidic, and increasing acid cannot protect teeth.
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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