There are a couple tricks to thermally straightening your curls.
First, use a light leave-in conditioner to help protect your curls. Put this in the same time you might a straightening product. Put each product in separately, not together.
Dry your hair almost dry. Then, take the hair into sections. This helps you focus on a small amount of hair at a time, cutting down the drying time.
Lastly, use a boar bristle round brush. The natural bristles will help smooth the hair. A wood base round brush will give volume and not as much curl. A metal base round brush will heat up like a curling iron and create more curl.
Best of luck,
Nicole
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If you must relax your hair, get it done professionally by: Anonymous
It looks like your hair would be very attractive curly with the use of the appropriate products and a nice cut. But if you really must have your hair straightened, get it done professionally -- it's not worth the risk of doing it yourself. (Spoken by one who knows.)
Go to someone who uses an assistant and will do your hair in sections, preferably one half then the other. If the entire head is done at once, there's a risk that the part that was done first will be too straight.
This method is more time-consuming and hence more expensive, but if you are relaxing for light control (which it seems is all you need) you won't have to go too often.
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Section it by: Anonymous
Just part it into sections, straight down the middle (so you have like two pigtails), and then with these "pigtails"... halve them - "top half" and "bottom half"- so in the end you have 4 sections all clipped/pinned up.
Then work on one section at a time, taking a small part from the section.
My hair is like yours, but far longer. It comes down to the middle of my back.
I used to straighten it, and it would take about 40 minutes. Now I don't - I have learned to love my curly hair.