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basics of the chemistry
'''Fluoride''' (F<sup>-</sup>) is the mildly [[toxic]] [[ion]]ic form of the element [[fluorine]]. It is a common additive to [[toothpaste]], [[mouthwash]], and [[Water fluoridation|city water]] throughout the developed world. It is commonly believed to prevent [[tooth decay]], since it tends to bond with the calcium in teeth.
'''Fluoride''' (F<sup>-</sup>) is the mildly [[toxic]] [[ion]]ic form of the element [[fluorine]]. It is a common additive to [[toothpaste]], [[mouthwash]], and [[Water fluoridation|city water]] throughout the developed world. It is commonly believed to prevent [[tooth decay]], since it tends to bond with the calcium in teeth.
It is believed by many to help harden teeth, although some research has shown the opposite effect. Unfortunately, fluoride also strongly attracts [[aluminum]], which some studies suggest causes [[Alzheimer's disease]].<ref>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3056430</ref><ref>http://www.controlyourimpact.com/articles/antiperspirant-aluminum-and-alzheimers-disease</ref><ref>http://www.rense.com/general37/alum.htm</ref>
It is believed by many to help harden teeth, although some research has shown the opposite effect. Unfortunately, fluoride also strongly attracts [[aluminum]], which some studies suggest causes [[Alzheimer's disease]].<ref>http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3056430</ref><ref>http://www.controlyourimpact.com/articles/antiperspirant-aluminum-and-alzheimers-disease</ref><ref>http://www.rense.com/general37/alum.htm</ref>
==Chemistry==
Human teeth (and those of many other animals as well) are covered with dental enamel, which is the hardest substance in the human body. It consists primarily of calcium phosphate, in the form of hydroxyapatite crystals. As fluoride is very reactive substance, it chemically bonds to this hydroxyapatite, resulting in fluoridated hydroxyapatite and fluorapatite. This resulting material seems to be more resistant to acids than the hydroxyapatite itself.
==Anti-Fluoridation Movement==
==Anti-Fluoridation Movement==