Question

To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is

• A. acidic
• B. neutral
• C. basic
• D. corrosive

Answer 1

The correct option is C

basic

Explanation:

Toothpaste:

• Toothpaste is usually weakly basic in nature.
• The pH of saliva is $7.4$ at ${25}^{°}\mathrm{C}$, which is basic in nature.
• Tooth decay starts when the pH of the mouth is lower than $5.5$ at ${25}^{°}\mathrm{C}$.
• An acidic environment will cause teeth enamel to corrode, and will ultimately weaken them.
• Toothpaste, which is generally basic, for cleaning the teeth can neutralize the excess acid and prevent tooth decay.

Hence, the correct option is C. To protect tooth decay we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is basic.