A breakthrough in hair technology using Heat Activated Polymers to provide long lasting, salon looking hair that stays resistant to frizz and beautiful for up to seven days. TRESemmé 7 Day Keratin Smooth System unique formula cares and nourishes from root to tip, ensuring the condition of your hair is not compromised. Its patented Thermal Technology works with the heat of your straighteners to produce a sleek, salon style that even lasts through washes. Salon styling results are achieved effortlessly with hair maintaining its natural movement, without leaving the hair feeling coated. Tipped as the fast-track fix to smoother, more manageable hair, Keratin 7 Day Smooth System makes slaving over constant styling and straightening a thing of the past, up to 3 washes Our philosophy from our origins in Salons in 1948.