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Background: The efficacy of rosella flowers as an antibacterial contains anthocyanin pigment which acts as an antioxidant, vitamins and minerals that are useful for the body so it needs to develop products other than drinks and food; one of them as herbal disinfectant for complete denture acrylic base. Objective: To determine the color stability of the complete denture base after cleaning with various concentrations of rosella flower extract. Method: This time series study with pre and post with control group design was carried out using 5 complete dentures cleaned with rosella flower extract toothpaste with a concentration of 2.5%, 5%, 10% and control, and assessed its color on the surface of the polished and intaglio surface. The value is processed into the formula ∆E * ab = [(∆L *) 2 + (∆a *) 2 + (∆b *) 2] 1/2 then analyzed using the Kolmorogrov test and t-test. Result: Rosella flower extract toothpaste at concentrations of 2.5%, 5%, and 10% did not show significant differences in color changes (p> 0.05). Conclusion: There were no significant differences in color changes at all concentrations after the acrylic base was cleaned with rosella flower extract.

The efficacy of rosella which are for bacteriostatic purposes and contain anthocyanin pigments as antioxidant, vitaminand minerals. There are so many benefits of rosella that it is necessary to develop alternative product of Rosellabesides as food and beverages. One of the alternatives is as herbal disinfectant for removable denture acrylic. The aimof the study is to observe the color changes of removable denture acrylic base after using extract and infusion ofRosella as denture cleanser. Each of 5 full dentures were utilized to observe the color changes before and after usingRosella extract with concentration 2.5%, 5%, 7.5 %,and 10% and also infusion with concentration 5% , 10%, and 20% . The values were obtained and inserted into the formula ∆E*ab = [(∆L*) 2+ (∆a*)2+ (∆b*). The results wereanalyzed by using Kosmorogrov and T-test. The study showed the extract of Rosella which have concentration 2.5%,5%, 7.5% and 10%, and infusion concentration 5%, 10%, and 20%, did not show significant difference in colorchanges (p