The widespread interest that has recently arisen in the problem of dental caries has given considerable impetus to the study of this prevalent disease of childhood, and has renewed the hope that its etiology and the means of its prevention may eventually be discovered. Tangible support for this hope may be found in the reports of successful experimental control of the disease which are appearing at frequent intervals in our present-day literature. Such pronouncements are welcomed by all those who are interested in public welfare and in the health of children, for up to the present time no practical means of preventing dental caries has been offered other than that of oral cleanliness, which is of doubtful efficiency. The discovery of some definite means of controlling or preventing this highly prevalent and important disease would be an inestimable boon to mankind.
In an analysis of these recent contributions there appears