1. Dental floss comprising a fibrous substrate coated with the difference between the weight of the dry coating on the first portion of the fiber base and the weight of the dry coating on the second portion fibrous substrate is 30% or menee.2. Dental floss according to claim 1, characterized in that the coating is present only on the surface portion of the fiber osnovy.3. Dental floss according to claim 2, characterized in that the coating is in the form polosy.4. Dental floss according to claim 3, characterized in that the strip is continuous along the length of the first and second portions of the fibrous osnovy.5. Dental floss according to claim 1, characterized in that the first and second portions are of the same fibrous base dlinu.6. Dental floss according to claim 1, characterized in that the fibrous substrate has a rectangular cross section and has two major surfaces that extend along the width of the fibrous substrate, and two non-core surface of vysote.7 extended. Dental floss according to claim 6, characterized in that the width of the floss is from about 0.7 mm to about 3.5 mm.8. Dental floss according to claim 6, characterized in that the coating applied to the fibrous substrate more than one of its poverhnosti.9. Dental floss according to claim 8, characterized in that on each of its major surfaces to form the coating formed polosy.10. Dental floss according to claim 1, characterized in that the coating contains active veschestvo.11. A method for manufacturing dental floss comprising the steps of: a. providing a fibrous substrate having a first portion and a second portion b. a coating comprising an active substance on the surface of fibrous base, so that in this case the difference between the weight of the dry coating on the first portion of the fiber dry weight basis and pokr1. Зубная нить, содержащая волокнистую основу с покрытием, при этом разность между весом сухого покрытия на первом участке волокнистой основы и весом сухого покрытия на втором у
