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Why does tooth decay start when the pH o...

Why does tooth decay start when the pH of mouth is lower than 5.5?

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Tooth starts decaying when the pH of our mouth is lower than 5.5 . This is because below this pH value , the medium of the mouth becomes more acidic due to which tooth enamel corrodes at a faster rate.
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The enamel of the teeth is made of a compound 'X'. It is the hardest substance of the body. It does not dissolve in water but gets corroded when the pH of mouth is lowered below 5.5 (a) Identify the compound 'X' (b) How does it undergo damage due to eating sweets? What should we do to prevent tooth decay?

VK GLOBAL PUBLICATION-ACIDS, BASES AND SALTS -VERY SHORT ANSWER QUESTIONS (1 mark)
  1. Name the acid present in vinegar.

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  2. Two solutions A and B have pH values of 5 and 8 respectively . Which s...

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  3. If a few drops of a concentrated acid accidentally spill over the hand...

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  4. If someone is suffering from the problem of acidity after overeating, ...

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  5. Arrange the following in the increasing order of acidic strength. Ac...

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  6. Why does tooth decay start when the pH of mouth is lower than 5.5?

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  7. Two solutions A and B have pH values of 3.0 and 9.5 respectively. Whic...

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  8. A knife, which is used to cut a fruit, was immediately dipped into wat...

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  9. Explain why an aqueous solution of ammonium chloride is acidic in natu...

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  10. What are the products formed when an acid reacts with a base ?

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  11. Fresh milk has a pH of 6. When it changes into curd (yogurt) , will it...

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  12. A white chemical compound becomes hard on mixing with proper quantity ...

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  13. Which one or these has a higher concentration of H^(+) ions ? 1MHClo...

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  14. In addition to sodium hydrogencarbonate, bakings powder contains a sub...

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  15. What is the commercial name of calcium sulphate hemihydrate?

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  16. Name the substance obtained by the action of chlorine on dry slaked li...

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  17. How many molecules of water of crystallisation are there in (i) Plas...

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  18. Why does the milkiness disappear on passing excess of carbon dioxide t...

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  19. An aqueous solution turns red litmus solution blue. Excess addition of...

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  20. (a). What happens when concentrated solution of sodium chloride (brine...

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