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Try making the sections smaller and tighter when you twist . I think the bulkier the hair (twist) is the quicker it'll start to become frizzy looking. The main differences that I see between your hair style and what your friend did is that she used smaller sections and she looked like she twisted your hair tighter. It's the same concept with cornrows, which is why braid my daughter's hair in small braids so that the style will last longer.
I have never done flat twists so I have no authority on the topic but after watching a few demos, I wanted to suggest holding the hair close to the base and then braiding the end to make it hold well: http://www.youtube.com/watch?v=7dd30v6wBq4
http://www.youtube.com/watch?v=sDtyJbW4TGg
The other suggestions I wanted to make is perhaps twisting the section before the cross over like I do for my two-strand twists might help create a frizz-free twist? I know when I tried to do a 3-strand twist as shown by Pokahontas and didn't do the single strand twirls before crossing them over, the end result was a frizzy twist that looked nothing like my two-strand (post showing a comparison).
. I have accepted the defeat on them and just now only do braidouts, since the braidouts work really well on my hair texture. 



Try making the sections smaller and tighter when you twist . I think the bulkier the hair (twist) is the quicker it'll start to become frizzy looking. The main differences that I see between your hair style and what your friend did is that she used smaller sections and she looked like she twisted your hair tighter. It's the same concept with cornrows, which is why braid my daughter's hair in small braids so that the style will last longer.

Thanks so much for this tip! I'm going to do three-strand twists the next time I twist. I looked at Youtube videos over the weekend & saw people doing the single-strand twirl before crossing them over, but I didn't think it was that big of a deal if I didn't do it. Now I know better.
LOL Why would anyone do 3-strand twists when two are so much easier to do and undo? No really, why not do the two strand twists with the twirl? Why, oh why do 3? Seriously, I really want to know.