This unit comes with 3 different heads - my favorite is the flossing head. Brushes your teeth and gives you a gentle "flossing" at the same time.
It's powerful - spins/vibrates much faster than anything I've used before, and I can go about a week before needed to recharge. And the fact that it's rechargeable is a big plus. No wasting batteries...my kids do that enough with their toys.