I have been using these brushes since they came out. Currently the production process is at an average level. The bristles fall out of the brushes. The battery charge is uneven, which causes the motor not to run at the specified speed even after a full charge. If you buy a model with a timer, the timers don't work very well and it can take a while for the toothbrush to turn off. I'm talking about several toothbrushes - I currently have three.
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