It Keps running, running, .........
This is my second Sonicare.  The first one lasted over ten years and I'm replacing it only because the battery no longer holds a charge.  If one does not jam the bristles into the teeth, the brush will last as long as the unit.  I regularly take the brush apart, soak it in a weak solution of bleach water and clean off residue inside the brush and charger.  UVs don't reach the inside and the chargers. And when the magnets inside the brush head get rusty brush them with a soft copper brush or scrape a little of the rust off with a pocket knife. Two brushes are needed for two people (unless you don't mind sharing) but otherwise an extra is a waste of money.
Rating: 5 stars