Catechins, a type of polyphenolic compound most commonly found in green tea, have scientific evidence supporting their role in supporting gum (periodontal) health. Multiple in vitro and clinical studies suggest that catechins possess strong antimicrobial, anti-inflammatory, and antioxidant properties, which may benefit oral tissues, including the gums.

Specifically, epigallocatechin gallate (EGCG), the most abundant catechin in green tea, has been shown to inhibit the growth of periodontal pathogens such as Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans. Additionally, catechins can decrease the production of inflammatory mediators (such as interleukin-1β and tumor necrosis factor-α) and reduce oxidative stress in gingival tissues, both of which are key contributors to periodontal disease progression.

Clinical studies have reported that green tea extracts or catechin-containing mouthwashes can reduce gingival bleeding, plaque accumulation, and pocket depth when used as an adjunct to standard oral hygiene. While these effects are modest and do not replace conventional dental care, the evidence supports a beneficial adjunctive role for catechins in gum health.

Overall, while more large-scale and long-term human trials are needed, current scientific literature provides moderate support for the use of catechins in supporting and maintaining gum health.