氟中毒的发生与饮用水中氟离子的含量成正相关，但发病率的轻重又受到钙、镁离子的控制。研究表明：我国南方氟病地区青少年氟斑牙的发生，并非完全由煤烟氟污染玉米所致，而与南方平均气温高，病区人群长期大量饮用含氟和钙、镁离子偏低的水有关，特别是很少食用煤烟氟污染玉米的城市，这种相关性显得更加明显。 The incidence of fluoride poisoning is positively related to fluoride ion content in drinking water, but the severity of the incidence is controlled by calcium and magnesium ions. The results show that the incidence of dental fluorosis in southern fluorosis areas is not entirely caused by the contamination of coal with soot and fluorine, but high with the average temperature in the south. The ward has long consumed a large amount of water with low fluoride and calcium and magnesium ions The relevance, especially in cities that seldom eat corn smoke and pollute corn, is even more pronounced.