Family history plays a huge role in your teeths basic health.
Not to say brushing and such isn't important, it's just some people have teeth like granit and they can go 10 years without even brushing with zero problems. I'm not one of those.
I go 2 times a year.
I have 3 fillings and 1 root canal in 44 years.
I am one of those lucky SOB's