L'Oréal Professionnel Paris Pro Longer Thickening Hair Mask for Thin Hair — Filler A-100, reduces split ends

This concentrated lengths-renewing mask targets long hair with thinned ends by resurfacing the fiber and adding substance to fragile strands. Formulated with Filler A-100, a patented filling molecule, and amino acids, the mask helps thicken the hair fiber while delivering deep hydration and surface renewal. When used as part of the Pro Longer regimen (shampoo + mask), studies show a reduction in the visible appearance of split ends versus unwashed hair.

How does this mask make thin lengthier hair look thicker?

The mask deposits a high concentration of filling molecules along the hair shaft to plump and smooth the fiber, improving the hair’s overall texture and visual density. Amino acids help reinforce weakened areas so strands feel stronger to the touch.

• Filler A-100 fills and smooths the hair surface for a fuller appearance
• Amino acids help fortify fragile lengths to reduce breakage
• Deep conditioning restores softness and reflects more shine

How should I use the Pro Longer Mask for best results?

Apply to freshly washed, towel-dried hair focusing on lengths and ends; leave for 3–5 minutes and rinse thoroughly. For deeper repair, replace your regular conditioner with the mask one to two times per week, and pair it with Pro Longer Shampoo and Conditioner for a complete protocol.

• Use after shampooing on damp hair, spread evenly through mid-lengths to ends
• Leave in for 3–5 minutes, then rinse for everyday maintenance
• Use 1–2× weekly as a deep treatment in place of conditioner for extra care

Will this product reduce split ends and breakage?

The formula is designed to reduce the visible appearance of split ends and fortify weakened fibers, helping to limit further breakage. Results are most pronounced when used in the recommended Pro Longer routine, which pairs complementary products for cumulative improvement.

• Clinical results show a reduction in visible split ends when combined with Pro Longer Shampoo
• Strengthening amino acids support resistance to mechanical breakage
• Regular use helps maintain smoother, more resilient lengths

How quickly will I notice changes after using the mask?

Many users observe immediate improvements in softness, manageability, and surface smoothness after the first treatment. Noticeable reductions in the look of split ends and stronger-feeling hair develop with consistent use over several washes.

• Instant: increased softness, shine, and detangling ease after one use
• Short-term: improved fiber smoothness within a few uses
• Ongoing: reduced visible split ends when included in a full Pro Longer regimen

Who is this for: L'Oréal Professionnel Paris Pro Longer Thickening Hair Mask is formulated for people with long, fine, or thinning ends who want to restore substance and manageability to their lengths. It suits anyone aiming to reduce the visible appearance of split ends and strengthen fragile hair without weighing it down. Professionals and home users looking for a salon-grade mask that complements the Pro Longer Shampoo and Conditioner will find it particularly useful.

Ingredients

Aqua / Water / Eau, Cetearyl Alcohol, Amodimethicone, Hydroxypropyl Starch Phosphate, Isopropyl Myristate, Behentrimonium Chloride, Phenoxyethanol, Trideceth-5, Isopropyl Alcohol, Trideceth-6, Glycerin, Caprylyl Glycol, Arginine, Panthenol, Trideceth-10, Lactic Acid, Cetrimonium Chloride, Benzyl Salicylate, Benzyl Alcohol, Linalool, Limonene, Acetic Acid, Hydroxycitronellal, Citronellol, Aminopropyl Triethoxysilane, Alpha-isomethyl Ionone, Polyquaternium-6, Parfum / Fragrance. C241158/1.