Background : Oral mucositis is an injury of normal mucosal tissue with an acute inflammation of the oral, tongue, and pharyngeal mucosa after exposure to chemoradiotherapy. Post chemoradiotherapy oral mucositis is commonly accompanied by painful swallowing or odynophagia. Povidone iodine 1% is an antiseptic mouthwash that widely used to prevent infections in the oral cavity. The aim of this …