Curling Iron/Curling Wand – If you have a good flat iron* you will eliminate the need for a curling iron* as most of them have curved edges that allow you to curl the hair as you straighten. However, if you want to get one ensure it is ceramic.
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I think a must-have for really curly, and thick, hair is the karmin g3 straightener. I have 3B hair and it leaves it pin-straight and shiny!