As someone who has tortured their hair by dyeing it blonde to black and black to blonde constantly, I started to give up on having healthy hair. I’ve tried so many treatments and different products. Finally, I tried Olaplex. This one product made such a huge difference and my hair started to feel soft and hydrated again. BUT the biggest change was when I used No 0 +No 3 together. No 0 helps repair and strengthen the hair while No 0 works as a primer, boost repair and strengthening. The site claims your hair will have 68% more repair and 3x stronger hair when these products are used together. I have used these two together twice now, and let me tell you! My hair feels amazing and looks SO much better. I would totally agree with these claims and I am so happy with the results!