Marginal gingivitis is inflammation of the gingiva at the margin characterized by a reddish and raised color that is not persistent in areas where bacterial plaque is concentrated. Cloves are an herbal ingredient that can be used as an alternative for treating gingivitis, especially in adolescents. Cloves contain active ingredients, namely essential oils that can inhibit plaque formation and act as anti-inflammatories. This research aims to prove the potential of clove extract solution (Syzygium Aromaticum) as an alternative herbal mouthwash for gingivitis in adolescents. The method used is quasi-experimental, with a pre-and post-test and a control group design. The population of this study was gingivitis patients at the Kolonodale Regional Hospital dental clinic. Sampling was carried out using random sampling. The sample consisted of 27. The dependent variable was the gingivitis score, the independent variables were clove extract, clove decoction, and no active ingredients and the confounding variables were the respondent's lifestyle and discipline. The patient intervention was carried out for 6 days with a pre-post-test examination of the gingivitis score. The samples were divided into 3 treatments, namely clove extract, clove decoction, and no active ingredients. Test results for the effectiveness of administering mouthwash with clove extract, clove decoction, and without active ingredients using the Non-Parametric Kruskal Wallis with a big value. 0.000 which means H1 is accepted, namely the treatment has a significant influence. The Mann-Whitney test showed that clove extract was more effective in curing gingivitis with a difference value of 1.89 for clove extract, 1.22 for clove decoction, and 0.33 for no active ingredient.