Materials and Methods:Disc shaped specimens were prepared and immersed in distilled water as a control group, tea, coffee and a Cola Drink for certain amount of days and the degree of conversion was analyzed between the Microhybrid based resin material and Nano filler based Resin composites. The solutions were changed after periodic readings. These specimens were rinsed with distilled water and dried with an absorbent paper before each color measurement was noted down. Results: The Fourier Transform Infrared (FTIR) Spectroscopy analysis showed that Nanocomposites had a higher degree of Conversion by calculation of the Bonded and free carbonyl peak intensities in the spectrum. The ratio of intensities was calculated by correlation of absorption bands related to C=C aromatic and aliphatic stretching and C=O free stretching. The Color Analysis showed that Microhybrid composites are more color stable than Nano composites. E values were significantly higher in coffee and tea when compared with the control solutions of distal water. Carbonated drink (Pepsi) showed clinically acceptable color change as well. Conclusions:From the FTIR spectroscopy data it was analyzed that the degree of conversion for Nanocomposites was 70% which is higher than the values obtained for Micro hybrid resin composites.ΔE values of light cured material Grandio Nano Hybrid were significantly higher after immersion in all 3 staining solutions when compared to Micro hybrid