Question

A compound P forms the enamel of teeth. It is the hardest substance in 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 chocolate and sweets? What should we do to prevent tooth decay?

Answer 1

(a) As mentioned that the compound P is an acid that causes tooth decay and is also the hardest part of our body, it makes clear that the compound is formed with Calcium (Ca) which is the hardest element found in our bone. As compound P is with pH of less than 5.5 that means it is an acid of Calcium (Ca).

Thus, compound P is calcium phosphate $\left[{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_3\right]$.

(b) Chocolate and sweets contain sugar which is converted into acid in our mouth and this acid with pH less than 5.5 erodes the tooth enamels and causes tooth decay.

1. To prevent tooth decay we should brush our teeth with toothpaste that neutralizes the excess acid produced in our mouth.
2. Avoid eating too many products of sugar and after eating any food wash your mouth with water gently to avoid any acid formation that causes tooth decay.