The most important thing that I learned was how to properly neutralize after a relaxer.
That tip alone is what is causing increased hair retention.
Second is the moisture/protein balance. I remember when I was 19 years old, my white, male hair stylist told me that I needed an intense reconstructor put in my hair BADLY. I looked at him like he was crazy 'cause I was using the entire Nexxus moisturizing line. Of course, I didn't listen.
Now #$@# years later, he was right and my hair is thriving for the first time.