Recurrent Aphtae Stomatitis (RAS) is a common disease with unknown specific etiology. One of its predisposing factors is hormonal imbalance which is related to menstrual cycle Objective: To compare the women reproductive hormone level between RAS and non-RAS patients. Methods: A case control study involving women, 40 with RAS and 40 non-RAS from Oral Medicine Clinic, Faculty of Dentistry-Indon…