I did nothing but wash, brush and occasionally braid my hair for 8 years and it grew from chin length to mid-thigh. Since then I've cut it shorter and wear it up a lot for school and work, but it was in pretty good condition when I paid no attention to it at all. I washed and conditioned it every day with whatever shampoo was on sale and left it down all the time except for dance classes.
I hope this works out for you!
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