Question

what should be the pH of mouth? why does our tooth decay​

Answer 1

Tooth decay can occur when the pH level in the mouth is 5.5. For reference, the neutral level is 7.0. When we consume acidic foods and drinks, the pH within the mouth decreases and can cause the pH in the dental plaque to fall rapidly below 5.0.

Answer 2

Answer:

pH of mouth should be 5.5 or more.

the food we eat are slightly acidic, which makes pH to fall below 5.6, which in turn makes our tooth to decay. That's why the toothpastes are made alkaline in nature in order to neutralize the acidity in our mouth