Living with a dentist I learned that the single most important factor (by far) in the health of teeth is the genetic factor. Some people do not brush their teet

Living with a dentist I learned that the single most important factor (by far) in the health of teeth is the genetic factor. Some people do not brush their teeth for years, never floss, have bad diets, etc. and still barely have a cavity. Others do it "by the book" and yet their teeth are a ruin. This is not to say that brushing teeth or flossing won't help. It will just not compensate if you pulled the genetic short straw. But as in every job dentists also feel pressured to point out other people's lack of quality work to promote their own. You'll see this in the IT guy who immediately recognizes that whatever the previous one did on your computer was amateurish and they can do it better, same with the electrician, the plumber, the mechanic, the plastic surgeon, etc.