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The silicon microcrystals which compose the patch detach the hair and they penetrate the pore until they reach the hair root.
As the silicon penetrates the pore and seethes painlessly the root, the result is a more irregular and deep cut than the cut of the blade. Furthermore, the movements produce heat, which accelerates this process. This weakens the growth of the next hair. If you are constant, one day the hair will stop growing.