大约二十年前,美国萨坎顿城(Sa(?)aton)印第安人的牙齿引起了公共卫生当局的注意,因为他们的牙齿虽然稍稍有几点黑斑,但却健康完整,不像一般人那样蛀洞累累。过了两年,又在另外一个城市里发现了同样不生牙蛀的事实。这两个城市的饮水,氟化物含量都比其他地方来得多。于是专家们作了有系统的研究,证 About twenty years ago, the teeth of Indians in Saqueton (United States) in the United States caught the attention of public health authorities because their teeth, although slightly dark spots, were healthy and intact, unlike most people That wormhole tired. Two years later, the same fact of non-decaying was found in another city. Both cities have much more fluoride and fluoride than anywhere else. So experts made a systematic study, card