Enhance the hair's structure for up to 5 washes with Professional Extra Liquid Hair. This molecular hair refilling treatment gives an effect of deep care with essential amino acids and reconstructs the hair fiber. The Liquid Hair's thermo activated formula refills the hair from the inside out and provides high performance through expert application. Deep care effect of essential amino acids. Liquid Hair is a molecular hair refilling treatment that reconstructs the hair fiber, reinforcing hair for up to 5 washes. The thermo activated formula refills the hair from the inside out and provides high performance through expert application. Shampoo the hair with a suitable System Professional Shampoo using the Shampoo Relax Massage. Towel dry the hair. Divide hair into 4 – 5 sections, apply 1 pipette of Liquid Hair on each section and distribute evenly from root to tip. Comb through and dry the hair with the hair dryer for 5 minutes to bond the ingredients to the hair. Alternatively you can use the hood dryer or the Climaxing on dry setting. This will take about 10 – 15 minutes. Rinse for 20 seconds to remove excess product. Style as usual.