Any heat usage on your hair can cause damage, but since a straightening brush lessens direct contact with heat than other products such as blow dryers and flat irons, it is a great choice for reducing potential damage. The main area to exercise caution is with your ends because you want to make sure that the ends don’t tangle on the brush—that could lead to split ends. To protect your hair as well as possible, always use a heat protector product before applying any heat to it.