his treatment is for those who want to grow longer, thicker hair. The Filler A-100 technology used is patented to L' OrÉal Professionnel, & it works by penetrating the fibre core to plump & thicken the hair from the inside. Amino acids in the formula work to strengthen the hair from the outside. The formula works on thin ends, or areas where help is most needed. Hair type: -Long hair with thin ends Results: -Ends filling from first application -Long lasting cumulative results -66% visible split ends reduction