Question

Why does tooth decay start when the pH of the mouth is lower than 5.5?

Answer 1

We know that a unit that shows the degree of alkalinity or acidity of a solution is pH. It is measured in a scale (pH scale) of 0 to 14. pH Value more than 7 in the pH scale indicates that the solution is alkaline and pH value less than 7 indicates that the solution is acidic and pH value 7 indicates neutral nature of the solution.

Complete step by step answer:
First we understand the tooth decay in detail. Due to tooth decay, enamel (outer cover of teeth) and dentine (tissue that forms bulk of teeth) becomes weak gradually. The tooth decay got started when acids are produced by action of bacteria on sugars and food particles which tend to soften the enamel. Bacteria in the mouth produce acids by the process of oxidation and the tooth decay starts when pH of mouth is below 5.5.

Additional Information:
Let’s discuss dental plaque in detail. Sometimes the binding of bacterial cells to the teeth in masses forms dental plaque. Due to this plaque, the teeth get covered and saliva could not reach the tooth layer to neutralize the acid. This causes decay of teeth and gum diseases.

Note:
Always remember that decreasing the bacterial load in the mouth protects our teeth from decay. The regular brushing and flossing removes the sticky accumulation of bacteria and teeth plaque. So, we should brush our teeth after eating. Also use of antimicrobial mouth rinse like Listerine helps to reduce the bacteria in the mouth.