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👉 Check Latest PriceThe L’Oréal Professionnel Série Expert Pro Longer Mask is an advanced, salon-grade treatment developed for long hair experiencing thinning or weakened ends. Enriched with L’Oréal’s exclusive patented Filler A-100 technology, the formula targets the hair fibre from within, helping to visibly renew length and restore thickness to areas most in need. This intensive mask reinforces the hair structure by penetrating deep into the core, delivering lasting strength and density throughout the lengths. When used as part of the complete Pro Longer protocol — shampoo, mask, and concentrate — it leaves hair feeling stronger, fuller, and visibly healthier. How to UseApply to towel-dried hair after cleansing with the Pro Longer Shampoo. Distribute evenly through mid-lengths and ends. Leave for 3 to 5 minutes, then rinse thoroughly. For optimal results, follow the full Pro Longer regimen.