I've waited to check until I've used them and as others have experienced batteries or something in the switch tends to fail prematurely. After a few weeks of use 1x daily. I usually use 1 tube of toothpaste for 1 toothbrush replacement and so far none of them have lasted half a tube. I unscrewed the button on one of these and tried to replace the battery, but disassembling the contacts or the slide switch got messed up and it never worked reliably after that. In my opinion, these brushes are not worth the extra cost.
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