Background: To evaluate caries activity by contrasting the pH levels in children without caries with those who have caries and explore the connections between these two groups. Materials & Methods: In this study, a sample of 40 children aged between 5 and 9 years was selected. The children were divided into two groups: (i) a caries-free group consisting of 20 children, and (ii) a caries-active group with 20 children. The significance level for all statistical tests was set at a p-value of 0.05 or lower. Results: An observation revealed that the average pH values were higher in the caries-free group, implying that as the tested parameters increase, caries activity tends to decrease. Conclusion: There is a clear correlation between the physicochemical characteristics of saliva, including its pH, and the presence of caries activity. Keywords: saliva, pH, dental caries.