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...http://www.google.fr/patents/US5941256?utm_source=gb-gplus-shareBrevet US5941256 - Dental hygiene article
