
My wife used an old sonic brush with two batteries for years. We still have two spare heads. The switch on it stopped working so I had to replace it. She has tried other sonic brushes, but of all the other brands, this single-battery model still has the largest brush. I agree with the other reviewer that it's not as powerful as the previous model, but it will do. I couldn't find any replacement heads for this model either and the ones sold online will only fit the older dual battery model. It remains to be hoped that the manufacturer will eventually decide to sell the heads themselves. It's still more powerful than some other brands, and if you've never had a dual-battery model, you'd probably find that it works great. I contacted Arm & Hammer about the availability of replacement heads and they told me that heads are not currently sold separately, only as a set with a brush.

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