Question

Enamel has calcium phosphate [Ca₃(PO₄)₂]. When we eat sweets, they form acid in our mouth which reacts and tooth decay starts. To avoid tooth decay, we should brush our teeth after every meal. Sonu brushes his teeth twice a day whereas Monu brushes once a day only. Answer the following questions.

(i) Is toothpaste acidic, basic or neutral? Give reason. 

(ii) What values are associated by Sonu, who brushes his teeth twice a day?

Answer 1

(i) Toothpaste is basic. 

a. Our tooth is made up of calcium phosphate. 

b. It gets corroded and damaged when the pH in the mouth falls to 5.5 (acidic). 

c. Bacteria present in the mouth produce acids from food particles which remains in the mouth after eating. 

d. The best way to prevent this is to clean the mouth by using toothpastes which can neutralize the effect of excess acid. 

e. Toothpaste prevents tooth decay. 

(ii) Sonu is concern and aware of the mouth problems caused by tooth decay. He is a well-mannered and a hygienic person.