The aim of the study is to evaluate the effect of different juices on the ph of dental plaque. 21 subjects were included in the study among 18–25 years of age group. Comparative evaluation of 3 different fruit juices (mango, lemon and orange) was done on the ph of plaque. All the subjects were divided randomly into 4 groups 1, 2 and 3 (7 subjects in each group). Ph of plaque was recorded before the administration of juices (at baseline), and after administering 100 ml of fruit juice from the index teeth(16,26,36,46) at 1min, 5 min, 10 min 15 min and 30 mins. Changes in Mean–plaque pH levels and mean pH difference after consumption of three different fruit juices at different time intervals was calculated .In this study lemon juice had more delirious effect on ph of plaque with statistically significant results at 1 and 5 mins post administration of juice.