Utilizing the newest in dental care technology, the Issa features high-density pulsations which are channeled through soft, bacteria-resistant silicone bristles, instead of the damaging scratching action that standard bristled toothbrushes use. It effectively removes stains and plaque while remaining gentle on tooth enamel and helping to prevent gum recession. Tongue cleaner attachment helps rid the tongue of plaque. Features: each charge lasts 6 months, brush heads last for one year, no charging dock requires, waterproof.