Can a Grain-Free Diet Reverse Tooth Decay?

Here's an interesting post from Stephen Guyenet of Whole Health Source called Dr. Mellanby's Tooth Decay Reversal Diet. He discusses a study published in 1924 called "Remarks on the Influence of a Cereal-free Diet Rich in Vitamin D and Calcium on Dental Caries in Children". Three different diets were studied for their effect on dental caries. The grain-free diet supplemented with vitamin D not only slowed the rate of dental caries, but actually reversed some decay.