These last forever!
I just buy the cheapest Oral B rechargeable toothbrush.  The first one I had lasted about 8 years and so I bought a second one.  I don't have any gum or mouth issues.  I'm not sure why anyone would buy a $100 toothbrush when a $20 works just fine.  The secret?  BRUSH YOUR TEETH!  I floss at night before going to sleep.  I brush twice a day.  Because this brush has a timer, I brush for a full two minutes (don't leave the water running while you brush!).  I feel like a powered toothbrush does a more thorough job than a regular toothbrush.  I don't leave it charging all the time.  It shortens the life of the battery.  I put it on the charger when it gets slow.<br /><br />I think this unit has been replaced with the flossing action version.  Get one or the other and brush often!
Rating: 5 stars