Even though the condition of one's teeth does depend on how well and how often you brush them — and what toothpaste you use — the truth of the matter is that it's mainly a genetic thing, and this has already been proven. The quality of the work done by the dentist also matters a lot. Modern techniques, technologies and dental repair products are much better than what they were 20 or 30 years ago, and many dentists back then were very eager to pull, even if the tooth could have been saved. Nutrition also matters — you need your vitamins — as does whether you smoke or not.
Myself, I am (sorely and sadly) missing over one third of my teeth already — it's almost all at the back, though at three of the four corners — and yet I have always taken very good care of my teeth. My brother is also missing a lot of his teeth already. My mom was missing several teeth by the time she was my age, and my dad had to have all of his teeth pulled by the time he was 30.
Anyway, the topic is consciousness, and considering that neuroscientists are now starting to concede to the purely Darwinian development of consciousness being only a narrow-minded fable, I think this article is very important.