Objective: To diagnose the risk of developing caries in pregnancy as a parameter for providing oral health and defining individually preventive programs for pregnant women. Methods: The research was designed as a section study using methods of social medicine and epidemiology. 150 pregnant women were examined. 50 of the pregnant women were asked to answer a specially designed test for this research. The sources for data were: the caries risk diagnosis test as instrument of research and part of the original set of methodological forms for following oral health, and the Preventive Program for dental health care of the inhabitants of Serbia. The test contains general and specific parameters of risk with data of the course of pregnancy, diet and oral status. The tested women were classified in the zones of low, middle and high risk. Results: Of all the 50 tested pregnant women, 62% of them were in the low risk zone, and 38% in the middle risk zone of caries risk. In pregnant women of the low risk zone DMFT was determined as 14.65; for pregnant women in the middle risk zone the average was DMFT of 17.05. Conclusion: Diagnosis of caries risk in pregnancy is a parameter for providing oral health in pregnancy with which we can determine the risk zone and contents of primary and secondary dental prevention in caring for the health of the pregnant woman and the future baby.