Adjunctive Effect of Green Tea Mouthwash Prepared at Different Steeping Temperatures on Gingivitis: A Triple-Blind Randomized Controlled Clinical Trial

Purpose: To compare the effect of green tea mouthwashes prepared at different steeping temperatures as adjuncts to mechanical plaque control on gingivitis. Methods: Forty-five women with gingivitis participated in this 4-week randomized controlled clinical trial. They received professional mechanical plaque control and rinsed daily with either warm green tea, hot–cold green tea or placebo. Dental plaque control record (PCR) and gingival bleeding indices (GBI) were recorded at baseline and 7, 14 and 28 days after. Results: Participants’ mean age was 20.7 ± 2 years. The mean scores for the PCR and GBI at baseline were 82.4 ± 19 and 85.8 ± 7, respectively. All groups showed significant reduction in PCR and GBI between Days 0 and 28 (p < 0.01). No significant differences in PCR were observed between the groups at any of the examinations (p > 0.01). The warm green tea group demonstrated significantly lower GBI at all examinations compared to the hot–cold group (p < 0.01). Conclusions: Within study limits, green tea-made mouthwashes significantly reduced plaque and gingivitis when used as adjuncts to mechanical plaque control. The green tea mouthwash prepared in warm water demonstrated significantly higher efficacy in lowering gingivitis compared to that prepared in hot water followed by ice.