Whether you are relaxed or natural, the use of direct heat is a point of contention with most hair gurus. Some advise absolutely no heat while some will say heat is ok as long as certain conditions are met. The best way to separate out fact from the noise is to look at studies done on hair to see what works and what doesn't.
We all know what heat damage on natural hair looks like, it is hair that does not curl back up and has lost some of it's tensile strength so it breaks easily. With relaxed hair, heat damage is harder to see with the naked eye but it is generally hair that has difficulty holding on to moisture and breaks like crazy.
Heat damage on a microscopic level is characterized by either tiny cracks appearing on the hair cuticles or blisters/bubbling on the surface of the hair.
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