Strengthen weak, fragile hair. 12 times stronger hair after one use. A professional strengthening breakthrough: Reinforce fragile hair with a system designed for minimally damaged hair to strengthen the hair str&. Formulas with Intra-Cylane & Bamboo, add resiliency & condition the cuticle. How to use: After Fiber Strong shampoo, massage into wet hair. Leave in 5-10 minutes. Rinse thoroughly. In case of contact with eyes, rinse them immediately.