Reconstructing masque that intensely replenishes brittle and damaged hair masque force architecte reconstructs the hair fiber while intensifying its strength from root to end to use apply a small amount to lengths and ends of hair focusing on mid lengths to ends leave on for 5 10 minutes and rinse thoroughly for best results pair with kerastase bain force architecte for the ultimate reconstructing cleanser ciment anti usure as a conditioning treat and fibre architecte serum as a leave in