The Philips Sonicare F1 standard oral irrigator nozzle is a powerful water flosser attachment that can be used with any Philips Sonicare Power Flosser. The F1 standard nozzle provides a powerful yet gentle single stream of water to remove debris from between teeth, helping to give you a cleaner and healthier gum line and all round smile. Its simple to use design along with the guidance tip mean that the F1 can find the correct placement along the gum line easily. Simply position the nozzle above the gum line, press gently so that the nozzle tip is in contact with the gum line and teeth and slide from one tooth to the next. We recommend replacing the F1 nozzle every six months.