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@DFP
There has been lots of research done on traditional cultures who were introduced to modern diets. Such as the australian aboriginals. Changes in diet radically changed teeth formation.
That study is pretty famous, I read it a few years back. Will see if I can dig it up.
But in my own instance:
My mum has the most impeccably straight tooth formation. As do any of my relatives who grew up in rural bangladesh where my "roots are".
Anyone who grew up here or as middle class urban bengali's , with access to sweets and pop 24/7. Has totally skewed tooth formation.
I think it supposedly down to both nutrition AND tooth decay. I think if your milk teeth get tooth decay problems (due to sugar and such) it harms the formation pattern of your adult teeth. Looking back, this is what happened to me.
http://www.westonaprice.org/traditional-diets/635-australian-aborigines.html
http://www.ppnf.org/catalog/ppnf/price.htm
Some pictures from Dr Prices book:
http://www.yourreturn.org/Articles/Images/Aborigines_Full.jpg