What Temperature to Curl and Flat-Iron Hair
How Hot Your Heat Tools Should Be Based on Your Hair Type
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Fine hair is defined as hair with strands that are very small in diameter. It typically can't handle as much stress as thicker or coarse hair, so for that reason, you should consider using very low temperatures when you heat style it.
"For finer hair types, you should definitely keep your hot tool under 300 degrees," Polko says. "If you need an extra pass at a slower pace, that's OK. Some things to keep in mind when using a flat iron or curling iron with fine hair is make sure you brush your hair out and always use a heat protectant."