text: continued....
  
  Water fluoridation, on the other hand, keeps a low concentration of fluoride in the mouth all during the day.  This fluoride incorporates into the saliva, and constantly bathes the teeth, therefore providing a very effective means of decay prevention.  Incorporation into saliva occurs systemically.
  
  Fluoridation costs less than $1 per person, per year.
  
  3.  The optimal level of fluoride is not a dose, nor is it relative.  It is that concentration of fluoride in water at which maximum dental infection prevention will occur in the population served by that water, with no adverse effects.  The optimal is 0.7 mg/L and us the official recommendation if the US Department of Health and Human Services.
  
  4. Your opinion on the effectiveness of fluoridation is obviously unqualified, and of no relevance.
  
  Steven D. Slott, DDS