Only regional surveys contain information about oral cancer [17] [18] [19] (Table 9 ). Calculated at a prevalence rate of 81-41.2 per 100 thousand, there are 100 thousand oral cancer victims in China, with 10 thousand patients dying each year. Besides, oral soft tissue diseases, oral and facial injuries and trauma, tooth abrasion, mucosal infections and diseases, developmental disorders, craniofacial anomalies are very common. 