Instantly get thicker fuller looking hair with redken cerafill dense fx from the first range for thin to advanced thinning hair the treatment contains cerafill system technology that works to strengthen hair fibres to prevent breakage and energise hair follicles to re densify hair the thickening treatment expands fibres that increases diameter by 9 to create fullness and density perfect for all hair types the thickening treatment nourishes to promote healthy hair and scalp benefits plumps