Two-year warranty Water tank 650 ml (90 seconds use) 10 speeds 7 heads It works with direct electricity Thrust force from 10 to 100 PSI The Waterpik Water Flosser provides a unique combination of... Water pressure and pulsations for deep cleaning between teeth and below the gum line To remove harmful bacteria and food residues that cannot be reached by... Use a traditional toothbrush and dental floss