Question

A compound 'P' forms the enamel of teeth. It is the hardest substance of the body. It doesn't dissolve in water but gets corroded when the pH is lowered below 5.5.
(a) Identify the compound 'P'.
(b) How does it undergo damage due to eating of chocolate and sweets ? What should we do to prevent tooth decay ?


CBSE Class X Science SA 2 (3 Marks)

Answer 1

(a) The compound 'P' is calcium phosphate.

(b) It undergo damage when the bacteria present in the mouth work on the left over food particles and produce acid.

To prevent tooth decay, toothpastes (basic) are used which neutralises the excess acid

Answer 2

A) compound P is calcium phosphate Ca3(PO4)2.

B) the bacteria present in our mouth get stick to the remaining food and produce acid which corrodes the tooth enamal.

To prevent tooth decay, brush daily twice a day so that the toothpaste(basic in nature) neutralize the effect of acid.