FOREO Issa™ Replacement head for sonic toothbrushReplacement head for revolutionary sonic toothbrushes FOREO ISSA. The brush head consists of soft and flexible silicone bristles that do not damage the gums and teeth and at the same time clean perfectly. It is made of fast drying, non porous and smooth silicone, which resists up to 10,000 fewer bacteria than a conventional nylon toothbrush. It is advisable to replace the head once a year. The spare brush head for the FOREO ISSA is available in