The Filler A-100 technology used is patented to L'Oréal Professionnel, and it works by penetrating the fiber core to plump and 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. This in–salon treatment for long hair visibly reduces split ends by 66%* and the hair feels and looks thicker and more plump from the very first application. There is also a single dose (15ml) application so your clients can continue the routine at home, between salon visits. This product needs a hair diagnosis by a professional. This treatment is for clients who want to grow longer, thicker hair. For long hair with thin ends. Results - Ends filling from first application, Long lasting cumulative results, 66% visible split ends reduction.