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Background: Mobile health (mhealth) intervention has been proved to be effective in weight loss, diabetes control and tobacco cessation Objective: To assess the effectiveness of mhealth intervention to reduce consumption of cariogenic diet. Design and setting: Randomized controlled trial in field setting Materials and method: Forty two adolescents who were in the "Watch-out" zone of sweet score were recruited for the study. The subjects were randomly allotted into the test group (n=21) and the control group (n=21). A three day diet diary was recorded from all study subjects and the average sweet score was assessed at baseline and at post intervention. The subjects in the control group received standard one to one dietary instructions tailored to the needs of the subjects only once at the start of the study. Subjects in the test group received tailored dietary instructions once daily through mobile application (Whatsapp). Intra-group comparison was made using Wilcoxon signed rank test and inter-group comparison was made using Mann Whitney U test. P value <0.05 was considered statistically significant. Results: The sweet score for the control group at baseline was 20.9±6.06 while the post test score was 13.16±4.37 and the difference was statistically significant (p=0.002). The sweet score for the test group at baseline was 18.02±4.03 while the post test score was 14.5±7.74 and the difference was statistically significant (p=0.03). However, there was no statistically significant difference in sweet score between the two groups at the end of the trail. Conclusion: mhealth intervention is effective in reducing sweet score among adolescents.