Question

The cause of tooth decay is pH of saliva
a-being less than 6.5
b-becoming 7
c-being less than 5.5
d-being more than 6.5​

Answer 1

Answer:

less than 5.5 it's answer may be [c]

Answer 2

Answer:

less than 5.5

Explanation:

since saliva has become a acidic medium for teeth

it will cause teeth to decay faster

(since acidic property)