It's probably more common among people who genetically have a stronger cuticle, with more shingle-like coverage. Asian hair is the most likely to get that glossy appearance naturally. With it comes very low porosity, sometimes to a point that it is called resistant hair - and it is resistant to just about everything. It won't hold heat styles, won't easily be bleached or dyed, and won't accept products well, making it especially susceptible to build up
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