Why Do Grains Cause Tooth Decay?

Grains contain anti-nutrients called "phytic acid" or tripsin inhibitors.  Anti-nutrients in grains, nuts, seeds and beans block the absorption of minerals and cause the body to excrete more minerals than it could ever gain by eating those foods.
Agricultural diets produce populations with smaller frames and frail skeletons.  
You'll notice in Holland where they eat a lot of dairy they have large bones and skeletons.
When Weston Price was studying the groups who lived without tooth decay, they all had the ancestral knowledge that grains were dangerous and they need to be properly prepared in order to be consumed.  This would include fresh milling, soaking, sprouting, fermenting and sourdoughing.  These are the steps which eliminate the anti nutrients and turn the indigestible grains into nourishing foods.  I have found however that when you are trying to heal your tooth decay you have to avoid grains all together, even the properly prepared ones.  A traditional, ancestral style Keto diet is the best way to heal the teeth.

In 1937, University of the Witwatersand conducted a study1 comparing crude and refined sugar and cereals and their ability to produce dental decay in the South African Bantu. They found these foods actually created displacement of Vitamin D and thus decalcification of the teeth, as Vitamin D is required for Calcium metabolism. 
The British Dental Journal 193, pages563–568 (2002) published an article showing that the frequency and amount of sugar consumed correlated with increased tooth decay. 
Grains and sugars are really your worst enemies in the fight against tooth decay and the anti nutrients which cause the excretion of your alkaline minerals, creates "the borrowing process".  This process is where your body starts borrowing its own alkaline minerals from the skeleton and teeth to maintain homeostasis in the blood.

1.​journals.sagepub.com/doi/abs/10.1177/00220345370160030201?journalCode=jdrb

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Check out the video below by 'Exclusively NU' reporting on a study which demonstrates sugary cereals cause tooth decay.