PROFESSIONAL USE ONLY: Professional long-lasting smoothing fluid. With the help of heat, it remodels the keratin bonds controlling frizz and making hair smooth and manageable. How to use: shake before use. Apply to dry hair after shampooing with pre-treat shampoo. Leave on for 20’ to 45’, depending on the type of hair and the desired result. Rinse the hair and proceed with the next steps. Advanced Formula: Keratin Complex + Hyaluronic Acid + Omniplex Tech. WITH GLYCOLIC ACID AND GLYOXYLIC ACID Formula Formaldehyde free - Thyoglycolic Acid/Thyoglycolate free - No neutralizing needed Acid base - Fragrance free 900 ml - 30.5 fl.oz.