慢性氟中毒是由于长期采食了被氟化物污染的饲料、饲草或饮水所引起的一种以“牙病”表现的慢性中毒症。病的特点是牙齿形成齿斑和过度的磨损,出现波状齿而发生咀嚼困难,营养不良,体弱无力,往往发生跛行,未老先衰,到冬季、早春缺草期间易爬栏不起而 Chronic fluorosis is a chronic “toothache” disease caused by long-term exposure to fluoride-contaminated feed, forage or drinking water. The disease is characterized by dental plaque formation and excessive wear and tear, wavy teeth appear chewing difficulties, malnutrition, weakness, often limp, not old and premature, to winter, early spring lack of easy to climb column fence