
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. (Xinhua/Luo Xuefeng)
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. (Xinhua/Luo Xuefeng)