Recently, China's gini coefficient (a measurement of wealth distribution of a society, the greater the value, the deeper the gap between rich and poor) keeps growing. According to the World Bank assessment, China's gini coefficient was 0.447 in 2001. In 2002, the Chinese Academy of Social Sciences calculated the gini coefficient at 0.454. In both years, China has exceeded the alerting threshold of 0.4, indicating that the income gap in China has been too wide [6] . For the difference in oral health status between rich and poor, it is the same story. Low-income populations and people in need of special care (aged people, children, disabled people) experience illness more often and need more treatment. Besides lack of money and ignorance of oral health knowledge, they do not have easy access to oral health care.