A sonicare toothbrush should last at least 3 years and, more often then not, upwards of 5 or more years. So how can you prolong the life of your toothbrush? Run the battery down as far as possible before fully charging the handpiece as you would your cell phone and DO NOT store it on its charger. In between use, place it in a drawer or even unplug the charger if youd like to store it on its base.