Here's a summary of Weston Price's stuff:

[link to nourishedmagazine.com.au]

Three Important Food Factors

Dr. Price documented that both water-soluble and fat-soluble vitamins are missing from our modern diets. Of particular note, is the near complete absence of fat-soluble vitamins in our modern diet. Without eating those special foods, and it does not have to be large amounts of them, but frequently, and enough to fulfill your bodies needs, you can be susceptible to tooth decay, gum disease, and other diseases.

Eating special foods with fat-soluble vitamins won’t cure tooth decay in themselves, but they are a part of the cure.

These special foods are as follows:
Raw grass-fed dairy including, milk, cheese, cream and butter.
Organs of sea animals including fish organs, fish heads, fish eggs, oysters, clams, mussels, and crab and lobster with the innards.
Organs of land animals, including liver, bone marrow, tongue, heart, kidneys, pancreas, adrenal glands, gonads and for the more adventurous, brain, eyes and stomach lining.

Dr. Price found that a characteristic of groups containing a high immunity to tooth decay is that they ate regularly from two of these three food categories.

Our modern diet is so lacking in these special foods, and they are not consumed in regular amounts, so it is no wonder why our bodies degenerate.