text: How ironic that Mr Kilpatrick ended his letter by invoking Darwin and Einstein --  each of whom upended the world of "known" truth in his time.  
  
  To those of us who have researched the full range of modern studies of the systemic administration of fluoride, its stern and admonitory "respect the past" boosters seem very much like the reactionaries who still reject Darwin's work.
  
  No one questions the efficacy of topical fluoride application  --  except, oddly, the enthusiasts for mass systemic fluoride ingestion, who dismiss it as irrelevant.  The World Health Organization has recently determined that water fluoridation is unnecessary in industrialized nations where fluoridated toothpaste is used regularly, but that science is not popular with fluoridation boosters.
  
  Of course, topical fluoride is typically pharmaceutical-grade, and thus is of no use to the industries which currently enjoy the profit they make by selling their hazardous waste product to municipal water systems.