Question

To protect tooth decay we are advised to brush our teeth regularly.
The nature of the tooth paste commonly used is
(a) acidic
(b) neutral
(c) basic
(d) corrosive

NCERT Class X
Science - Exemplar Problems

Chapter_Acids, Bases and Salts

Answer 1

the nature of toothpaste is basic 

Answer 2

tooth decay occurs when the pH falls to 5.5,since toothpaste is alkaline or basic in nature so it helps to neutralize the excess acid in mouth..