Flavanols are a subclass of flavonoids, naturally occurring compounds found in foods such as cocoa, tea, apples, and berries. Scientific evidence suggests that flavanols possess antioxidant, anti-inflammatory, and vasodilatory properties, which may be beneficial for oral health, including the gums (periodontal tissues). Several studies have investigated the effects of flavanol-rich foods—particularly cocoa and green tea—on gum health. For example, in vitro and animal studies have shown that flavanols can inhibit the growth of periodontal pathogens and reduce inflammation associated with gum disease. Human studies, though fewer, have indicated that consumption of flavanol-rich products may reduce markers of gum inflammation and improve clinical parameters such as gingival bleeding and pocket depth. One randomized controlled trial found that a mouth rinse containing green tea flavanols reduced plaque and gingivitis over several weeks.

Nonetheless, most of the research is preliminary, with small sample sizes and short durations. While the mechanistic rationale is supported by laboratory data, and limited human trials show promise, large-scale, long-term clinical trials are lacking. Therefore, while there is emerging scientific support for the use of flavanols to support gum health, the evidence is not yet robust enough to warrant a higher rating.