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In the 1950' a TV commercial convinced people that fluoride was outstanding for teeth. By brushing, yellow teeth would become white, and cavities would be eradicated. Dentists concurred and encouraged the use of fluoride. So, through clever marketing, it became an urban belief that fluoride in toothpaste would be fabulous for strong healthy cavity free white teeth.
But why, when you read the toothpaste label, does it say, 'do not swallow?' Perhaps, this is because too much fluoride is toxic and could severely injure a child if he or she consumed a tube?
Today most believe that fluoride is extremely beneficial, to prevent cavities, and create white teeth. So when fluoridation of water began in the 1960's very few questioned it, maybe people assumed that more was better.