Question

About ph in tooth decay

Answer 1

Saliva can help neutralize the acid,but the pH of saliva can become more acidic after eating acidic food.In that time,the lower pH of the mouth creates an optimal environment for bad bacteria, which eventually cause tooth decay.

Answer 2

$pH \: \: of \: \: Tooth \: \: Decay \: is \boxed{ \red{less \: than \: 5.5 \: }}$