A dental floss is formed as a strand, including threads braided with each other in a multi-looped manner so that forming knobs connecting adjacent quasi-flat sections that, while being stretched in a straight line, are sequentially disposed and twisted relatively to each other, whose cross-sections can be approximated to a rectangle-like figure having a width and a height greater than the width. The heights of two adjacent quasi-flat sections are disposed at a predetermined angle to each other. Due to particular braiding, the quasi-flat cross-sections and the knob's cross-section encompass different numbers of thread pieces, forming a multi-planar surface with bulges, thereby providing for a unique adhesive property increasing the floss cleaning power, grabbing and removing plaque particles from the tooth surface more efficiently than the conventional ones. It's exemplarily produced by means of adapted overlock machines, of polyester, colored, flavored, un-waxed, waxed, or impregnated with specific therapeutic agents.