The hair fiber is made up of millions of internal bridges. Heating appliances, coloring, bleaching break these bridges and the hair is visibly damaged: split ends, straw effect, breakage. Strong internal bridges are the secret to healthy hair. For the first time, our Pro Bond Repair protocol with Citric Acid recreates, rebuilds, and strengthens the broken internal bridges of the hair. The hair is restored and regains its original strength. The Protocol: Start by generously applying the SOS Pre-Shampoo to your damp lengths. Leave on for 5 minutes then rinse. Then apply the Sulfate-Free Shampoo followed by the Intense Detangler. Our commitment does not stop at the beauty of your hair. For over 30 years, L'Oréal has been committed to beauty without animal testing.