At what pH value tooth starts to decay?

Q. At what pH value tooth starts to decay?
Answer: 5.5
Notes: One way tooth decay can occur is when the pH level in the mouth begins to fall below 5.5. The neutral pH level is 7.0, so this will drop when acidic foods and drinks are consumed. When the mouth is exposed to long periods of low pH, it allows cavity causing bacteria to grow and develop.

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