Introduction: Education of children and parents about proper and regular oral hygiene, avoiding cariogenic foods and regular check-ups by the dentist contribute to dental health. One of the main tasks of the nurse in the practice is precisely the education of children and parents about preventive procedures in the occurrence of caries. Objective:To determine the level of children's knowledge about the influence of food and hygiene habits on the occurrence of caries. Subjects and methods: Seventy children who came for dental examinations at the Ozalj Health Center, in the period from June 1, 2023 to June 30, 2023 participated in the research.. Data were collected using a questionnaire consisting of 19 questions, and were processed in the statistical program Statistica 14.0.0.15 (TIBCO Software Inc.). Results: Girls and boys visit the dentist equally often and maintain oral hygiene equally well. Only a small number of children are afraid of the dentist, from which we can conclude that an early visit to the dentist plays a significant role in the occurrence of fear. As expected, younger children consume cariogenic foods more often than older children. According to the results, we can conclude that children have a very good knowledge of oral hygiene. They are equally well educated considering their age and gender. Conclusion:Good oral health means absence of pain and good physical and mental development.Although the research has shown good results, this does not mean that the implementation of education and preventive measures should be stopped. On the contrary, they should continue to be continuously maintained and implemented so that the quality of children's oral health continues to be good and even better.