Very damaged hair Damage by mechanical factors: Hair dryer Damage by chemical agents: pollution, metallurgy, aggressive remedies Brittle hair, prone to breakage, dull and rough to the touch In all these cases, the only solution is the "Xstrong" treatment, which works deeply to rebuild the structure of the hair and restore it to its original beauty. Rebuilds the hair fiber from within, covering and protecting the skin, for a unique action of instant refilling