Fenrisúlfr
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I've never had split ends, but I don't straighten my hair very often and I always use a low setting. I think I just have very healthy hair though, because the women who play with my hair always ask what products I use to keep my hair in such great condition and they act surprised that I don't do anything other than wash it wish shampoo. I don't even use conditioner, which some people have trouble believing.
As far as trimming it, a few people have told me that it's a good idea to do so every few months to avoid split ends, but since I've never had split ends anyway, I don't bother and my hair doesn't seem to suffer any as a result. With regard to hair growing from the root, I bring this up whenever they imply that clipping it will help it grow faster and then they respond with something like "um..." and that's about as far as the conversation goes. I suspect that this is probably just a myth invented by some parental figure to try to convince their children to practice better hygiene.
My stylist said my hair did not appear damaged (so the straightener had a marginal effect at worse), but she advised me hair genes are passed from the mother's father, and since my maternal grandfather (according to my mother) balded at an early age, she said given my age (21), my hair is just thinning. That could well be it...