Medicine: Red Before Cavities

In Stickney Township, on the outskirts of Chicago, kids who never heard of Dentist Raper (see above) may soon be using his arguments to browbeat their parents into serving backward meals. For Stickney eighth-graders have just had a colorful demonstration of what sugar left in the mouth may mean.

At the bidding of a dental-health educator, the kids chomped energetically on a wad of flavored wax. When the wax had done its job of stimulating a free flow of saliva, the dentist collected a saliva sample from each child and mixed it with a special reagent. Within a few minutes, the samples...

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