Abstract: A dental water jet flossing apparatus comprises an elongated, flexible tubing attached at one of its ends directly to a household water supply, preferably at a point where water temperature can be controlled, as at the water outlet pipe mounting a shower head. The opposite end of the tubing is connected to a hand-held unit that is configured to releasably mount a dental water jet nozzle. A water flow control valve is included in the hand unit and configured to engage the flexible tubing and selectively constrict the latter to various desired degrees to selectively control the amount and rate of water delivered through the tubing and hence expelled from the nozzle. A syphon cup containing mouthwash or the like may be provided in-line to meter desired fluids into the water being delivered out of the nozzle and into the user's mouth.