United States Patent Number 6,145,516
November 14, 2000
A dental hygiene article, including a dental floss, and a microcapsule associated with a portion of the floss. The microcapsule includes a pigment encapsulated within the microcapsule for changing the color of a portion of the floss associated with the microcapsule upon rupture of the microcapsule as an indication of use or release of an active agent.
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