I don't have a problem with breakage or splits since my hair is only shoulder length, but my favorite brush has a mixture of boar and plastic bristles. I think the boar bristles smooths my hair, distributes the natural oils, and helps with static, while the plastic bristles help the brush penetrate my hair so that it makes it all the way to my scalp.
I've tried a couple of different bbb's and they just couldn't make it all the way through to my scalp. So, if I could only have one type of brush, and had to choose between a plastic or boar bristle brush, I would defintely choose the plastic one.
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