Only 25% of the hair exposed to the higher temperature was damage free. Though the hair started out as tightly curled, the end result was looser, bigger curls or waves that were almost straight. Of the hair that was straightened at 428☏, 37.5% of the participants couldn't regain the natural pattern of their curl.
The hair that was straightened at a temperature of 365☏ didn't experience any overall changes in the curls. Then the hair was rewet and air dried to see how the straightening affected the curls.
Hair was straightened 50 times at both temperatures. Before straightening, the hair type was categorized as tightly curled. In a study from the Journal of Cosmetology & Trichology, researchers examined the effects of two flat iron heat settings on natural, curly hair: 365☏ and 428☏.
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