【关键字】 口腔溃疡;病因;预防保健;

    abstract： Recurrent oral ulcer (ROU) is also called recurrent aphthae or recurrent aphthous ulcer， its incidence of a disease is among the greatest in dental， clinical manifestations. Clinical symptoms are often indicated by single or multiple sizes of round or oval ulcer， with chronic， recurrent features. Healing depends on time particularity， mostly for 7 to 14 days. Symptoms are mostly shown in oral soft tissue rich areas such as tongue ......