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A chemical-based hair therapy designed to increase hair elasticity, sheen, thickness and health. The treatment helps reduce unwanted curls and roughness, and works best for naturally curly or frizzy hair. After the sealing process, wash hair the next day with shampoo formulated for keratin-treated hair and avoid products containing sodium sulfate. Treatment results typically last 2 to 4 months depending on the original hair condition. Long hair may require more than 3 hours.