Citrus junos, commonly known as yuzu, has a history of traditional use in East Asian cultures, particularly in Japan, Korea, and China. It is valued for its aromatic rind and juice, which are used in cuisine and folk remedies. Regarding its use in supporting the gums (oral health), there is some traditional precedent. In Japanese and Korean folk practices, yuzu has been included in various remedies for oral hygiene and sore gums, largely due to its pleasant flavor, acidity, and perceived antibacterial properties. However, much of this use is anecdotal and passed down through generations rather than documented in formal medical texts.

Scientifically, yuzu contains vitamin C, flavonoids, and essential oils, all of which can contribute to general oral health. Vitamin C is important for gum health, and deficiencies are known to cause gum issues such as bleeding and inflammation. However, there is a lack of direct clinical studies specifically evaluating Citrus junos extracts or preparations for their efficacy in maintaining or improving gum health. Most available evidence is either general (relating to vitamin C or citrus fruits) or based on laboratory studies highlighting antimicrobial properties of yuzu essential oil against some oral pathogens, though these are preliminary and not specific to gum health outcomes.

In summary, the use of Citrus junos for gum health is justified primarily by traditional practices and some general nutritional considerations, rather than robust scientific validation.