I believe 2-in-1 shampoo and conditioners were originally targeted for men in the military, who were required to take quicker showers and had regulation haircuts. So not for people with hair long enough to fall to their ears.
Remember that your hair follicle is dead, doesn't heal, and shampoo damages it. So think of shampoo as something for cleaning your scalp, and conditioner for caring for the rest of the follicle without damaging it.
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