Strengthen Pro Is used immediately after the Ultra to seal and re-form the bonds to maintain the integrity of the hair structure and health of your hair during colouring. Strengthen Pro is a vegetable protein blend which penetrates deep into the hair fibre.  These proteins create a new structural connection within the hair reducing the damage of bleaching and chemically treated hair.   Testing has shown that the hairs structural strength is increased by 7 times.   Colour with confidence in the knowledge that your hair structure has the upmost strength and integrity…