Abstract: A dental floss dispenser is disclosed, which is adapted for mounting onto a pump toothpaste dispenser. The dental floss dispenser has a one-piece housing of integrally molded plastic construction which has a peripheral contour to match the predetermined bottom configuration of the toothpaste dispenser. The housing has a base with a peripheral wall having a recessed ledge and slot in the peripheral wall to dispense the floss. The dental floss spool is rotatably mounted on one of two bosses in the housing. The housing also has a hinged door which matches the predetermined bottom configuration of the toothpaste dispenser which is capable of movement away and against the peripheral base wall to expose the slot through which the floss is dispensed. A cutter is mounted on the hinged door allowing the severing of a desired length of floss pulled from the spool through the slot.