It's interesting you posted this thread. I have had a total of 5 keratin treatments and the last one ruined my hair (fault of the stylist, not the product). She over-flat ironed certain sections near my face and after 6 months those parts are spagetti straight while the rest of my hair is 3c curly. I have regrowth now too, so about 3 inches from the scalp is tight curls and the rest of the section around my face is dead straight. It looks terrible.
I am currently researching black-hair retexturizers, as well as Aveda Smooth Infusion retexturizing treatments, to see if I can even out this mess.
Any feedback would be appreciated!