L'Oréal Professionnel Serie Expert Pro Longer Hair Mask for Long Hair helps thicken long hair for visibly healthier and stronger lengths. ▶When used with Pro Longer Shampoo, hair fibers will be 69% stronger. * L'Oréal Professional obtained a patent for the A-100 Filler technology used, which works by penetrating the core of the fibers to fill the hair and increase its density and thickness from within. The amino acids in the formula strengthen the hair from the outside. The formula works on thin ends or areas that need help. *Shampoo + concentrate + mask with effective test
