Recurrent aphthuos ulceration is one of the famous diseases widespread among population. Theorists tried to see the causes and treatment this disease. This book focuses on Bactierological( Types of bactreia in the ulcers), immunological changes (Interleukin-2, Interleukin-10, Human secretory IgA, Tumor Necrosis Factor type and CRP Factor) and the biochemical changes (Iron and Zinc levels) of serum and saliva of patients, The study group consisted of 37 patients with recurrent aphthous ulceration, 19 females and 18 males ranged between 13-62 years old. Patients with family history of aphthous...