Dental and oral health problems based on The Global Burden Disease in 2016 stated that dental caries is still experienced by almost half of the world's population. One of the factors causing caries is salivary pH. This research is an experimental research with pre and post test designs. The research sample of students from the Department of Dental Health is 100 samples taken by simple random sampling. Data were analyzed using univariate test and multivariate test using One Way Anova Test followed by Post Hoc Test. Based on the results of the study, it was found that in the One way Anova test there was a significant difference in the average of gargling with rosella flower extract mouthwash 20%, 40%, 60%, and chlorhexidine on salivary pH, but based on the Post Hoc test, rosella flower extract mouthwash 20 % as effective as 40% rosella flower extract mouthwash, but different from 60% rosella flower extract mouthwash. Thus, it was concluded that the effectiveness of 60% rosella flower extract mouthwash was significantly stronger in increasing salivary pH than Chlorhexidine mouthwash, this was shown in statistical test.

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Background: Health is the most important part in human life. Plaque is a soft deposit, which is firmly attached to the surface of the teeth. Bay leaves (Syzygium polyanthum) which contain active compounds such as tannins, flavonoids and essential oils that can inhibit bacterial growth. Title: The Effectiveness of Gargling with Bay Leaf Decoction on Decreasing Plaque Score in Adults in Sukabangun 1 RT 19 Sukarami District. Objective: To determine the effectiveness of gargling boiled water with bay leaves on reducing plaque scores. Methods: this study uses a quasi- experimental research method (quasi-experimental). Respondents: adults in Sukabangun 1 RT 19, Sukarami District. Results: The results of the One Way Annova statistical test on plaque index examination before gargling with boiled water, 1 hour after, and 2 hours after with good, moderate, and bad criteria, obtained a P-value of 0.010 which means significant, meaning for gargling water Salam leaf decoction with PHP can reduce plaque scores. Conclusions: 1. The average plaque index before gargling with bay leaf boiled water was 3.09 (Medium) 2. The average decrease in plaque index after gargling was 2.45 (Medium) 3. The effectiveness of bay leaf decoction is able to reduce plaque scores in the treatment before rinsing and after rinsing, this is evidenced by the decrease in plaque scores and the One Way Annova statistical test.