Medical staff make dental checkups for children in a kindergarten in Hefei, capital of east China's Anhui Province, Sept. 17, 2019. (Xinhua/Liu Junxi)

　　Children learn the right way to brush teeth in a kindergarten in Hefei, capital of east China's Anhui Province, Sept. 17, 2019. (Xinhua/Liu Junxi)

　　Medical staff make dental checkups for children in a kindergarten in Hefei, capital of east China's Anhui Province, Sept. 17, 2019. (Xinhua/Liu Junxi)

　　Children learn the right way to brush teeth in a kindergarten in Hefei, capital of east China's Anhui Province, Sept. 17, 2019. (Xinhua/Liu Junxi)