 In terms of management of oral mucositis, maintaining of oral hygiene and avoid infection are essential manner. Topical agents such as sucralfate, benzydamine, antifungal drugs, vitamin E and treatment using laser were studied in the management of oral mucositis. Previous studies indicated the glutamine significantly reduced the incidence and severity of oral mucositis in patients underwent chemotherapy and bone marrow transplantation. However, few studies discussed the effect of glutamine on the impact of oral mucositis in head and neck cancer patients receiving radiotherapy withwithout chemotherapy. 