You may have heard of a dentist named Dr. Weston A Price and his book, Nutrition and Physical Degeneration, where he researched the world over to find answers about degenerative dental health.
The information is intriguing and very convincing, yet there seems to be a missing link between his research dating back to the 1930's and what the Weston A. Price foundation today recommends as a healthy diet - by consuming a lot of animal products, fat and organ meat and limiting fruit and vegetable consumption.
Here's a great article all about his research and what the current foundation espouses.
Also thanks for John Coleman for providing me with this quote:
"...cooking renders food pasty, so that it sticks to the teeth, and undergoes acid fermentation. Furthermore, the cooking of food greatly diminishes the need for use of the teeth; and thus tends to diminish the circulation of blood to the jaws and teeth, and to produce under -development of the maxillary and contiguous bones—thus leading to contracted dental arches, and to malocclusion and impaction of the teeth, with complications of great seriousness."- Forbes, E. B., The Ohio Journal of Science. Vol. 33, No.5 (September, 1933), 389-406