Item : B001GE9WVW Customer Reviews Superior to the old style brush heads, and Cheaper Too! by .. diljs () These new heads, which fit ONLY the new Flexcare and ProResults models of brushes, are superior to the old Elite style brush heads in several ways. The standard head remains the same size and shape as the old heads, but adds the following: 1. No more old toothpaste/mildew/mold/germs collecting in the base of the brush head! By far the most unpleasant aspect of the old Sonicare brushes, this problem is gone with the smaller, simple to rinse off ProResults heads. 2. New "indicator" bristles let you know when it's time to change. A common feature in manual brushes, it's nice to see this on a Sonicare brush head. 3. Less waste - there is less bulk to the new ProResults heads, meaning much less waste and more environmental benefit. 4. Best of all, the new models are actually CHEAPER than the old models. You get a 3 pack of brush heads for what 2 of the old brush heads costs. They're still more expensive than manual brushes, but its worth the price for the superior brushing experience. Overall the new brush head system is great - just make sure it fits your handle. You need a Flexcare or ProResults Sonicare handle to use these brush heads (sorry elite and essence users!).