Thanks for the suggestion, I'm back at it with the sunflower as of this morning. It could be worth a try to see if makes a difference using other oils.
Years ago when I was a kid, I remember some dentist at the time telling me about the different mineral content in some peoples teeth being such that they do not have really white teeth. Don't know if there was anything to that. In those days nobody was concerned about how white anyones teeth were, just healthy. Point being my teeth have never been really white, we shall see though! Don't want to get hung up on that because I think there are so many other good benefits!