Little-known mouth fluid may lead to test for gum disease

A little-known fluid produced in tiny amounts in the gums, those tough pink tissues that hold the teeth in place, has become a hot topic for scientists trying to develop an early, noninvasive test for gum disease, the No. 1 cause of tooth loss in adults. It's gingival crevicular fluid (GCF), produced at the rate of millionths of a quart per tooth.

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