I used to believe this. Then I got a Girlfriend who I know brushes twice a day. Yet got cavities relatively often. I don't know why this is but there is a very

I used to believe this. Then I got a Girlfriend who I know brushes twice a day. Yet got cavities relatively often. I don't know why this is but there is a very large factor(or factors) that just makes some people much more vulnerable to cavities.