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Solution


Q.

To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is:
1 Acidic  
2 Neutral  
3 Basic  
4 Corrosive  

Ans.

(3)

When we consume acidic food or drinks, the pH of the mouth falls to 5.5 due to which tooth decay occurs. This lowering of pH within the mouth can lead to dental plaque. To protect this, doctors advise to brush the teeth with the toothpaste which are basic in nature as it neutralises the acidic condition inside the mouth. Hence, the nature of the toothpaste should be basic.