Why does bacteria in our mouth become harmful to our teeth, while bacteria inside our body is usually kept in check and co-exists within us?

Question

Why does bacteria in our mouth become harmful to our teeth, while bacteria inside our body is usually kept in check and co-exists within us?

In: Biology

Answer 1

It’s the foods we eat. All the sugar. Our ancestors ate the diet we evolved to eat and it was much nicer on the teeth.