OK everyone: stop eating / drinking lots of things...
From Scientific American, January 2008 "Second Thoughts About Fluoride"
Page 80: A FLUORIDE DIET
The optimal range for daily intake of fluoride—the level that maximizes protection against tooth decay but minimizes other risks— is generally considered to be 0.05 to 0.07 milligram for each kilogram of body weight. Consuming foods and beverages with large amounts of fluoride can put a diet above this range. Below are typical trace levels of fluoride, measured in parts per million (ppm), found in foods and drinks tested at the University of Iowa College of Dentistry.
3.73 ppm Brewed black tea
2.34 ppm Raisins
2.02 ppm White wine
1.09 ppm Apple- flavored juice drink
0.91 ppm Brewed coffee
0.71 ppm Tap water (U.S.-wide average)
0.61 ppm Chicken soup broth
0.60 ppm Diet Coke (U.S.-wide average)
0.48 ppm Hot dog
0.46 ppm Grapefruit juice
0.45 ppm Beer
0.45 ppm Baked russet potatoes
0.35 ppm Cheddar cheese
0.33 ppm Flour tortillas
0.32 ppm Creamed corn (baby food)
0.23 ppm Chocolate ice cream
0.13 ppm Brewed chamomile tea
0.03 ppm Milk (2%)