Appeal to ridicule fallacy.
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The antifluoridationists' ("antis") basic technique is the big lie. Made infamous by Hitler,
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Godwin fallacy (guilt by association)
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The fact that there is no supporting evidence for such claims does not matter...
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... and this article is guilty of the same lack of supporting evidence. Also, burden of proof fallacy.
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A variation of the big lie is the laundry list. List enough "evils," and even if proponents can reply to some of them, they will never be able to cover the entire list. This technique is most effective in debates, letters to the editor, and television news reports. Another variation is the simple statement that fluoridation doesn't work. Although recent studies show less difference than there used to be in decay rates between fluoridated and nonfluoridated communities, the benefit is still substantial. In fact, the Public Health Service estimates that every dollar spent for community fluoridation saves about fifty dollars in dental bills.
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Begging the question fallacy.
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A key factor in any anti campaign is the use of printed matter. Because of this, antis are very eager to have their views printed. Scientific journals will rarely publish them, but most local newspapers are willing to express minority viewpoints regardless of whether facts support them. A few editors even welcome the controversy the antis generate -- expecting that it will increase readership.
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Appeal to common practice fallacy.
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The aim of anti "documents" is to create the illusion of scientific controversy. Often they quote statements that are out of date or out of context. Quotes from obscure or hard-to-locate journals are often used. Another favored tactic is to misquote a profluoridation scientist, knowing that even if the scientist protests, the reply will not reach all those who read the original misquote.
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Strawman fallacy.
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Half-truths are commonly used. For example, saying that fluoride is a rat poison ignores the fact that poison is a matter of dose. Large amounts of many substances -- even pure water -- can poison people. But the trace amount of fluoride contained in fluoridated water will not harm anyone.
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Guilt by association fallacy.
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"Experts" are commonly quoted. It is possible to find someone with scientific credentials who is against just about anything. Most "experts" who speak out against fluoridation, however, are not experts on the subject. There are, of course, a few dentists and physicians who oppose fluoridation. Some of them object to fluoridation as a form of government intrusion, even though they know it is safe and effective.
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Ad hominem fallacy.