Inside a Purdue University lab, a movable flat hair iron goes over a hair strand while an infrared microscope measures the changes in the hair's structure.
Researchers say early results are a bit inconclusive. It turns out that everyone's hair is different and that there's no exact temperature where hair straightening becomes hair damage. For example, people with naturally curly hair can suffer more damage from heat irons than those with straight hair.
Reid says they will continue their research in the hopes of finding that heat sweet spot for stylists.
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