Question

Choose the correct answer from the following
1.We brush our teeth everyday with toothpaste to prevent tooth decay. What is the chemical nature of toothpaste
a)Acidic
b)Basic
c)Neutral
d)Amphoteric

Answer 1

Dear Student

1(c)Our teeth is made up of the chemical Hydroxyapatite Ca₁₀(PO₄)₆(OH)_2.When acid attacks our teeth the enamel diffuses to Ca2+ ions and HPO₄ ^{2 -} ions.
The chemical reaction is :
​Ca₁₀(PO₄)₆(OH)₂ +8H+ →10Ca^{2 +} +6HPO₄ ^{2 -} +2H₂O

Toothpaste consists of Flouride , which replaces OH in hydroxyapatite and forms Flouroapatite Ca₁₀(PO₄)₆F₂. This Fluoroapatite is more resistant to the attack of acids.
The reaction of attack to our teeth/dacaying of teeth is called Decalcification.

REGARDS