(a) Explain the pH change as the cause of tooth decay. How can we prevent tooth decay caused by pH variations?
(b) Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
a)Lower pH in the mouth creates an optimal environment for bad bacteria, which eventually causes tooth decay. The pH of your mouth can change depending on what foods you are eating. The basic compound in tooth enamel, calcium phosphate, is attacked by acids and cause the decay of tooth. So to prevent it, the effect has to be neutralized.
b) Water is a neutral element. Aquatic animals cannot bear too much of basic or too much acidic behaviours. So to lessen the danger we can make the lake water neutral by adding acid to it if the water is too basic and vice versa.