L'Oréal Professionnel's Smooth Transformer Keratin Alpha Sleek smoothing treatment is the heart of the routine: formulated with a Keratin-Alpha Shaper and amino acid chains, it is designed to reprogram the hair deep within its keratin.

Applied once a week and then heat-activated, it provides up to two weeks of smooth hair, with frizz and volume control between salon visits. Results improve with each application. For frizzy, unruly, or humidity-sensitive hair.

• Up to 5x smoother hair, 2x less frizz
• Up to 77% more shine
• 2x faster daily styling
• Up to 2 weeks of smoothing and volume control
• 70% of women said they had never had hair this smooth*
• Free of artificial dyes and alcohol

Available size: 200 ml

Instructions: Once a week, after using Keratin Alpha Sleek shampoo, apply 30 to 50 g evenly from mid-lengths to ends. Leave on for 10 to 15 minutes, then rinse thoroughly. Blow-dry completely, then activate with a flat iron. On other wash days, use the Keratin Alpha Sleek mask.

*Consumer test.