Nutrition has a significant role in teeth health that is completely ignored by dentists. Apparently, vitamin D and vitamin K2 can do more for you teeth than regular brushing, provided that you don't keep your mouth sugared for too long: see e.g. http://www.westonaprice.org/journal/journal-spring-2007

And a pre-emptive answer to all those who will say Weston Price was a quack: No, he wasn't. Ignore the soundbites, read his studies, and modern follow-ups.