Question

why does tooth dcay start when ph of the mouth is lower i low than 5.5​

Answer 1

Explanation:

the pH within the mouth decreases and can cause the pH in the dental plaque to fall rapidly below 5.0. This happens through the production of acids as the bacteria metabolize the ingested nutrients. When the mouth undergoes dramatic or long-lasting periods of low pH, it can cause cavity-causing bacteria to grow

Answer 2

Answer:

Hey friend!

So basically the pH of mouth is 6.7 which is almost neutral. When we eat sweet or greasy food and don't brush, the food sticks in our teeth and enables bacteria to release acids which decreases the pH to below 5.5 which is acidic. This acid demineralizes the enamel of our teeth and causes tooth decay.

Explanation:

Hope it helps you. Do mark me as the brainliest.