prevents the floss from coming off the bow even if during use between dental gaps a tensile strength tending to remove the floss from grooves 20 is imparted it can further be noted that the specific configuration of the flap 21 shown in fig3 nevertheless allows to mould the bow and its corresponding tine with a single mould countermould pair without having to perform complex removal operations of the moulding components as can be understood the objects set forth in the preliminary remarks are perfectly achieved through the bow according to the invention as a matter of fact the floss cartridge though being shorter than a spool is nevertheless of a significant size so as to avoid early run out since the floss runs on three useful sides moreover the triangle like arrangement allows to exploit three different floss orientations with respect to the handle which aids an effective and advantageous use in many parts of the dental arch again the replaceable cartridge element has a very small plastic portion coinciding with plate 4 with a consequent negligible economic and environmental impact it is intended however that the invention is not limited to the specific embodiments illustrated above which represent only non limiting examples of.