In a group of children from seven to sixteen years of age there was no relation between calcium and phosphorus content of the saliva and the occurrence of dental caries. When the diet was supplemented by the daily addition of one quart of milk and two ounces of tomato juice, with or without viosterol, there was a slight tendency toward a decrease in the incidence of dental caries. This improvement in tooth condition was not accompanied by any consistent change in the salivary calcium and phosphorus. Evidence has been presented that the volume of saliva secreted in a unit time should be considered in interpreting salivary analyses.