As a brush, it carries out its functions to the fullest extent possible; I purchased two of them, one for myself and one for my partner; we are both pleased with the level of cleanliness they provide. The only issue is that you need to purchase a new clean head (standard). Apart for the X3 brush, everything else in the transaction appears to be an original or a Chinese clone. Regarding the X5, I was unable to locate it anywhere for purchase. The existence of an NFS chip, which causes the usage counter to be immediately reset, distinguishes the X5 version of the attachments from its predecessor, the X3. Up to this point, you will need to purchase X3 and manually reset it within the application. If you take the original, you won't find any difference in the quality of the nozzles themselves when compared to the whole one.
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