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Life has gotten much easier for me once I started detangling on DRY -stretched hair SOAKED w/ my conditioning concoctions! 4B hair tends to shrink like crazy when wet - making detangling a very difficult task - so detangling while my hair is already dry & stretched is MUCH easier as long as the conditioning mix provides slip!
So like was stated before the hair is NOT really dry at all, it's very well lubricated w/ conditioner just without the soaking wetness from rinsing/washing beforehand, therefore preventing massive shrinkage...
Even though I wash in braided sections, the braids still shrink and I have found detangling BEFORE washing truly life-changing ... when I used to detangle while wet after washing, removing one braid at a time and trying to get rid of the shed hair, etc, I would lose WAY more hair -even if my conditioner had crazy slip-and it was really frustrating having to deal w/ all that shrinkage on top of all the knots & tangles trapped in the shrinkage
.. My strands are fine so they are more fragile when wet - giving me more of a reason to detangle "dry" w/ conditioner
I even tried to detangle under running water w/ my hair soaked in conditioner and even though the water pressure stretched my hair out a little, this method was a no-no for me b/c the water would just wash away all my good conditioner so the slip would not last long enough for me to successfully detangle my dense hair-even in sections!
I honestly think it depends on your hair texture b/c I have a very small patch of silky 3B at my nape (weird huh!) LOL - but anyway, this section actually seems to stretch when wet and does not tangle nearly as much - I have NO problem detangling it when wet or dry w/ conditioner b/c unlike my the other 95% 4B hair, it does not shrink up as much --so I can see why those w/ looser textures would prefer to detangle soaking wet, it seems like it would be better b/c the water tends to make those curls lay down