First, there are the temperature settings. Obviously, different hair requires a different heat level. The thicker your hair is, the higher level of heat you should apply to straighten it. I highly recommend you to read the instructions which usually say what temperature you should select for your particular hair type. This may vary a little bit from one flat iron to another. The general rule here is the less heat you apply, the better your hair condition will be. And always use a heat protectant, regardless of your hair type.
A replacement as loved the first ghd straightener I bought.
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