Question

chapter 2 science 10 ncert solution
why does tooth decay start when the pH of mouth is lower than 5.5​

Answer 1

Explanation:

saliva has a ph normal range of 6.2 -7.6 with 6.7 begin the average ph. Resting ph of mouth doesn't fall below 6.3 .In the oral cavity the ph is maintaining near neutrality by saliva.

when the ph in the mouth falls 5.5 tooth decay started because bacteria present in the mouth produce acids by degradation of sugar and food particles which remain in the mouth after eating. The acid produced in the mouth attack the enamel thereby , creating tooth decay.

Answer 2

Explanation:

⚡⚡ Hope this'll help U ✌ ✌