Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 2 - Chapter 2 Acids, Bases and Salts

Question 98 Exercise

(a) Explain why the pH in a person’s mouth becomes lower after each meal.

(b) What damage could be caused while the pH is low?

(c) How could the person change his eating habits to lessen chances of suffering from tooth decay?


(a) The main reason for the low pH in a person’s mouth after each meal is due to the acid formation due to the activity of bacteria. After meals, the sugar in the food item is broken down into acids by the bacteria, and as the acid has low pH acidity increases.

(b) While pH in the mouth is low tooth decay can occur, which is formed due to the acidity in the mouth.

(c) Tooth decay can be prevented by ourselves without consulting a doctor. Always brush your teeth two times a day after having food. Before sleeping, brushing our teeth is a must, as the chances of bacterial action are more when we are asleep. Avoid sweet items like chocolates and ice creams.

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