. Being my hair is prone to to buildup and my scalp to dandruff I also clarify every week with a teatree shampoo even without using grease.
I mentioned my grandma and great grandma had hair that is APL. That means arm pit length which is in fact below the shoulders. Their hair was thin and stayed same length. I personally dont consider anything shorter than APl to be long hair. I suspect it was from a heat damage but.. I also dont think they got they ever got trims. Could be a factor.