Weston A. Price in _Nutrition and Physical Degeneration _  gave
Whole-Grains a Clean Bill of Health

http://www.soilandhealth.org/02/0203CAT/020305ppnf/PPNF.
"Our study of each case included careful examining of the mouth;
photographing of the face and teeth; obtaining of samples of saliva for
chemical analysis; and a study of the program of nutrition followed by
the given case. In most cases, the diet was strikingly modern, and the
only children found who did not have tooth decay proved to be children
who were eating the natural foods, whole rye bread and plenty of milk."
(pp. 36-7)"

"In the cases of three other children in the same group, there were
only three cavities, and one case was without dental caries. Two of
these three had been eating dark bread or entire-grain bread, and one
was eating dark bread and oatmeal porridge. All three drank milk
liberally." (pp. 39-40)"

"Price concluded of all this data:
  "High immunity to dental caries, freedom from deformity of the
dental arches and face, and sturdy physiques with high immunity to
disease were all found associated with physical isolation, and with
forced limitation in selection of foods. This resulted in a very
liberal use of dairy products and whole-rye bread, in connection with
plant foods, and with meat served about once a week.
  "The individuals in the modernized districts were found to have
widespread tooth decay. Many had facial and dental arch deformities and
much susceptibility to diseases. These conditions were associated with
the use of refined cereal flours, a high intake of sweets, canned
goods, sweetened fruits, chocolate; and a greatly reduced use of dairy
products." (pp. 42-3)"