Effect of Rice Hulls and Other Seed Hulls on Dental Caries Production in the Cotton Rat

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Abstract
The anticardiogenicity of seed hulls in the cotton rat diet was demonstrated. Rice, peanut, cottonseed, and pecan hulls were evaluated. Rice bran was also found to be anticardiogenic. Three varieties of rice hulls were found to contain different amounts of anti-cariogenic activity. Their relative activities were dependent on whether caries-susceptible or caries-resistant cotton rats were used to evaluate them. The rice hulls appeared to act synergistically when 2 varieties were fed in combination. As the dietary level of rice hulls was increased, the degree of caries reduction was also increased. A study of the gross components of the hulls indicated that their concentration was unrelated to the anticariogenic activity of the hulls. It was found that autoclaving partially destroyed the activity of the one rice-hull variety that was studied.