UNBELIEVA BROW gel by L'ORÉAL PARIS . L'oréal Paris presents this long-lasting gel formula to achieve thicker and denser eyebrows in 3 easy steps: 1. Apply the product on the eyebrow to fill in possible unpopulated areas. 2. Use the brush to outline and define the desired eyebrow shape. 3. Comb the eyebrows with the brush.