Strait Therapy is an innovative thermal straightening system. The first long-lasting hair straightening system that permanently straightens for 6 to 8 months giving hair an amazing gloss and shine. An innovative, thermal straightening system, which achieves the easy-to-style, poker-straight hair as well as ultimate shine. Strait Styling Strait Therapy treatment is an effective Straightening technique that straightens hair for 6 to 8 months. It gives hair that extra radiant gloss and silky smoothness that other straightening methods can. It is uniquely developed as a thermal system.