Looking at the reviews it looks like I'm the only one with this problem. In the process of brushing, the foam from the toothpaste turns bright gray, it seems that this metal rod gives oxide. I can’t determine the source, I even changed the nozzle. This gray coating is still not so easily washed out. Gray circles appeared in the bathroom the size of the circumference of the base of the brush in places where the last time the brush was left after use. I can't find the cause on the internet either.
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