Students learn about oral hygiene ahead of national day for dental care
chinadaily.com.cn/Xinhua | 2017-09-20 09:21
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A medical staff member from Xuanhua district hospital gives knowledge about teeth to students in Houjiamiao central primary school in Zhangjiakou, North China's Hebei province, Sept 18, 2017. [Photo by Chen Xiaodong/China Daily]
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