A medical worker instructs students the correct way to brush teeth at a school in Lincheng county of Xingtai city, North China's Hebei province, Sept 18, 2021. China's Dental Care Day falls on Sept 20. [Photo/Xinhua]
Students learn the right way to brush teeth at a school in Lincheng county of Xingtai city, North China's Hebei province, Sept 18, 2021. [Photo/Xinhua]
Students learn the right way to brush teeth at a school in Lincheng county of Xingtai city, North China's Hebei province, Sept 18, 2021. [Photo/Xinhua]
Students learn the right way to brush teeth at a school in Lincheng county of Xingtai city, North China's Hebei province, Sept 18, 2021. [Photo/Xinhua]
A medical worker examines teeth of a student at a school in Lincheng county of Xingtai city, North China's Hebei province, Sept 18, 2021. [Photo/Xinhua]
