L'oreal Pro Longer Concentrate 400 ml with FILLER-A100 and Amino Acid, the longest tip-filling concentrate of the Expert Pro Series is the ideal treatment for long hair with thinner tips. Thanks to the high concentration of the patented molecule FILLER-A100, this professional and disruptive formula provides instant strength and long-lasting thickness at the ends. L'oreal Expert Pro Longer Series is the perfect treatment for hair that has thin ends, allows the ends to fill out, lengths are brighter and stronger, and ends are thicker for longer. What is the result of Loreal Pro Longer Concentrate? Filled hair tips from the first application. Long-lasting, cumulative results. L'OREAL PRO LONGER CONCENTRATE HOW TO USE? Once a week, replace your conditioner or lengthening mask with Loreal Pro Longer Concentrate. Apply the concentrate at the ends.