The aim is to determine the effect of two dietary drinks Coca Cola and Tropicana orange juice on the surface hardness of two aesthetic nanocomposite materials. Materials and methods: The materials included nanocomposite materials Shofu Beautifil II and Estelite α- supranano composite. A sample size of 120 specimens of 5.5mm × 3 mm in dimension of each restorative material was prepared . The discs were divided into 2 groups of 60 specimens each and each subgroup of 20 samples each .The discs were immersed in different beverages in time intervals of 1 hour,1 day and 1week . Surface hardness tests were performed before immersion and at time intervals of 1 hour,1 day and 1 week intervals. Statistical analysis used was one way ANOVA. Results: Exposure to Coca Cola and Tropicana orange juice reduced the hardness of both the nanocomposites with Coca Cola showing greater reduction in hardness between the two with p<0.05. Shofu Beautifil II showed greater reduction in hardness than Estelite α-supranano at all time intervals. Conclusion: Estelite α-supranano showed better results compared to Shofu Beautifil II .Clinicians should therefore judiciously decide which material will be better for patients taking into consideration their dietary habits and lifestyle.