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Background : Exposing enamel to soft drinks and beverages causes changes in the microscopical morphology. Changes in the physical characteristics, like hardness and surface roughness, were studied with various parameters. Factors such as pH, exposed duration, and other content of the soft drinks have different effects on the enamel.    Methods : Thirty-six human premolar teeth were randomly divided into three groups (n=12). Group 1 consisted of teeth which were immersed in artificial saliva (control), group 2 consisted of teeth which were immersed in Pepsi, and group 3 consisted of teeth which were immersed in Mirinda. After the preparation of samples and necessary measures, surface roughness was measured using the profilometer. Baseline measurements were taken. Reading two and reading three were taken after exposing the specimens for three days and 15 days, respectively. All of the collected data were compared statistically using SPSS and presented in tables and graphs.    Results:  At the baseline, the surface roughness value was the same for all three groups. On the 3 rd  day, the Mirinda group showed more surface roughness compared to that of the test and Pepsi groups, which was statistically significant. On the 15 th  day, both the Pepsi and Mirinda groups showed increased surface roughness compared to that of the control, which was statistically significant.    Conclusions:  Within the limitation of this study, it can be concluded that surface roughness increased when teeth were exposed to both soft drinks

Evaluation of the effect of soft drinks on the surface roughness of dental enamel in natural human teeth