| http://www.w3.org/ns/prov#value | - The cheaper fluoride, he says, is a by-product of phosphate fertilizer production. ???It???s actually coming out of the plant???s air filters, and it contains heavy metals, including arsenic and lead,??? says Tittel. ???Our concern is that, as we are fluoridating the water with these materials, we are also adding a lot of other toxic chemicals.???
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