据中国预防医学科学院营养与食品卫生研究所1998年报告，茶叶对人体口腔粘膜白斑的干预研究获得良好结果。口腔癌是在世界恶性肿瘤发生率中占第6位的一种癌症，在我国占全国恶性肿瘤的3％。近年来，在中国、美国、日本和法国等国家均有上升趋势。口腔白斑是世界卫生组织认定的 According to the 1998 report of Institute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, the intervention of tea on oral leukoplakia of human body has obtained good results. Oral cancer is the sixth most common malignant tumor in the world. It accounts for 3% of all malignant tumors in the country. In recent years, there has been an upward trend in countries such as China, the United States, Japan, and France. Oral leukoplakia is recognized by the World Health Organization