The professional rebuilding enriched with hyaluronic acid. The mechanical action of incorrect styling, excessive use of hair straighteners or hairdryers or the chemical action of atmospheric agents and pollutants or even certain treatments, are all factors that can compromise hair health, making it weaker and leaving it looking opaque, coarse to the touch and extremely fragile. REBUILDING TREATMENT is the Xstrong treatment to restore extremely damaged hair to its original beauty. It works in just 15 minutes on all extremely damaged hair types.