Abstract: Improvement in floss box for public place, wherein the box comprises a general structure (1) that is defined by a base (2) to be mounted against the wall, and a cover (3) defined in a way to recover all internal devices of the box; the base (2) incorporates a mounting support (4), wherein it is positioned a bobbin (5); the base (2) receives the mounting of the direction pulley (6), which is fixed along with an axis (7) centered on the base (2), said pulley having a small channel (8), wherein the floss box hereby treated characterized by the fact that in the bottom of the channel (8) of direction pulley (6) is provided a perimeter cavity (9); the referred perimeter cavity (9) retains floss (X) along with periphery of direction pulley (6), making the said floss (X) to assume a more favorable condition at the moment of its exposure due to the expelling device (10) action.