For me personally, braids do cause split ends due to friction from my clothes as the hair is still down. It prevents tangling to a large degree, but definitely causes me more split ends than just having my hair loose would, as the braid is heavier than individual strands and thus causes heavier friction. I think as long as the hair is down and in contact with something, it won't be beneficial in terms of split ends, but of course some people's hair could just be so strong that it remains largely unaffected by it.
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