White Oak Bark is a slightly tonic, powerfully astringent, and antiseptic. It is useful, internally in chronic diarrhea, chronic mucous discharges, passive hemorrhages, and wherever an internal astringent is required. Oak Bark has also been used for: Bruises, Excessive Menses, Fevers, Gallstones, Mouth Sores, Pyorrhea, Toothache, Sore Throat, Varicose Veins, Urine Increase