English Oak (Quercus robur) has a long history of traditional use in European herbal medicine, particularly for conditions affecting the gums and oral cavity. The bark of the English Oak is rich in tannins, compounds known for their astringent and antimicrobial properties. Historically, decoctions or infusions of oak bark have been used as a mouthwash or gargle to strengthen gums, reduce gum bleeding, and address minor mouth inflammations. These traditional practices are documented in various herbal texts from the 16th to 19th centuries across Europe, where oak bark was commonly recommended for oral hygiene and the treatment of sore or spongy gums.

From a scientific perspective, while there is some in vitro evidence that tannin-rich extracts from oak bark can inhibit certain oral bacteria and reduce inflammation, robust clinical research specifically validating English Oak for gum health in humans is lacking. Most contemporary uses are thus grounded in historical precedent rather than strong modern scientific validation. The mechanism of action is believed to stem from the astringent effects of tannins, which can help contract gum tissue and limit bleeding, as well as provide a mild antibacterial effect. Nonetheless, oak bark is not a mainstream ingredient in current dental care, and its use is largely confined to traditional or folk remedies.