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A doctor conducts an oral examination for Lu Mengrui, a pupil of Qingchuan Primary School in Nanning, southwest China's Guangxi Zhuang Autonomous Region, on Sept. 20, 2009. China's 21th Teeth-care Day falls on this Sunday. A total of 12,000 children in Guangxi have received oral examination and pit and fissure sealing for free. [Xinhua]
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