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Recently in Japan, the highest incidence rate of dental caries have been shown among infants, school age children, and even among adults in comparison with other diseases. The result from an investigation into the actual incidence of dental diseas es (ministry of Health and Welfare, 1970), is shown in Figure 1. As for milk teeth, the average number of dental caries per person in Japan was higher than that of West Germany, the United States, and Denmark. In Japan, when mothers noticed an outbreak of milk teeth caries in their children, some tried to take their children to the dentist's office. However, when this was attempted, almost all of them were surprised at the amount of time it took to make an appointment, and to see the dentist. For mothers, especially working mothers, this was very inconvenient. Others ignored the

A health education program for the prevention of dental caries of preschool children.