Anecdotal comments, in my opinion, are particularly unhelpful when it comes to dentistry. Many people have teeth prone to all kinds of problems despite perfect hygiene and brushing. Others have, essentially, indestructible teeth. The last time I went to the dentist was 27 years ago. I was told I had three cavities that needed filling. Never got it taken care of. Nearly 30 years later, teeth are working great. But, like I said, I don’t draw conclusions from this as there are others — apparently — who brush twice a day, see the dentist regularly, and nevertheless have a mouthful of problems.