The Sichuan Pagoda Tree (Sophora japonica), also known as Huai Hua in Traditional Chinese Medicine (TCM), has been historically used for various medicinal purposes, including supporting oral and gum health. In TCM, its flowers and buds are considered to have "cooling" and "blood-clearing" properties, and they are sometimes incorporated into formulas aimed at treating bleeding disorders, including bleeding gums (a symptom of gum disease). Historical texts and materia medica indicate its use to "cool the blood" and stop bleeding, which is relevant for conditions such as gum bleeding due to heat in the blood or inflammation.

However, there is limited modern scientific research directly linking Sophora japonica to improved gum health. Some phytochemical studies have identified bioactive compounds such as flavonoids (notably rutin and quercetin) in the plant, which possess anti-inflammatory and antioxidant properties. While these properties could theoretically benefit oral tissues and reduce inflammation, clinical trials specifically evaluating the gum health effects of Sophora japonica are lacking.

In summary, the use of Sichuan Pagoda Tree for gum support is primarily justified by traditional use in Chinese herbal medicine rather than robust scientific validation. The evidence rating is moderate for tradition, but weak for scientific backing due to the paucity of direct clinical studies.