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

The nature of the toothpaste commonly used is (c) basic.

Here's why:

1. Tooth decay is primarily caused by acids in the mouth. These acids are produced by bacteria that break down sugars from our food.

2. The enamel, which is the outermost layer of our teeth, is made up of minerals. Acids from bacteria can erode these minerals, causing tooth decay.

3. To counteract this acid and help neutralize the pH level in the mouth, toothpaste is typically made to be basic.

4. Basic substances can neutralize acids, which helps to protect our teeth from the acid produced by bacteria.

5. Therefore, the toothpaste we use is typically basic in nature to help protect against tooth decay.