Replacement brush heads for Oral B electric toothbrushes from other manufacturers. They're significantly cheaper than Oral-B heads and last a while. Users are strongly recommended to replace the nozzles every 3 months; however, each of these heads will wear out after about 3 weeks. I did an autopsy on one of them to see why it failed so quickly and found that the vibrating plastic mechanism was simply being deformed by the soft plastic. But: you get a lot of heads for a low price, and it's probably an acceptable deal!
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