The Sonicare toothbrushes are inspired by dental equipment and therefore create dynamic fluid cleaning action.  The first time you use a Sonicare, you'll notice that the cleaning technique feels entirely different than any other toothbrush.  No two mouths are exactly the same, so your power toothbrush shouldn't treat them that way. The new Sonicare 9500 has two brush head sizes and two different speeds so that you can tailor your brushing to your own unique needs. Your teeth will feel cleaner than ever!