I'm not sure. I'm only at the end of my first go with my infinity sew ins. I'm VERY gentle and cautious with my hair because I'm trying to fill in areas my previous stylist didn't inform me about the damage. I do like these and this method above all else, and I have tried EVERYTHING. I bought the leave-in blending concoction for $40+, it is half full, and it is so watered down that it pours out of the container/tube. HOWEVER, for someone who refuses to use heat on my hair and HAS TO BLOWDRY extensions, the blow dryer IS HEAVEN SENT!! Cut my drying time in half and smoothing out the frizz/mess to smooth straight hair 24+ inches real with one crown of infinity extensions, only took like 2 strokes with my brush and the dryer...what would normally take 90+ mins took 30. No lie. Buy the rose gold w/ the 3 color options....it's the one with the concentrators...turbo power on cold air...it's the cheaper one too....I would not lie!! I'm at least grateful for that, thus far...to be continued....??? Only 5 weeks in...