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To comb your hair straight, you will need to use a medium or fine-toothed comb, depending on the thickness of your hair. This method is good if you will have some time to keep combing your hair until it dries.  Keep in mind that this method will only work on straight or wavy hair. For example, if you are going to be riding in a car or bus for a while, then you might want to try combing your hair straight. You can also use a brush if you prefer, but it might result in wavier hair.
Get a medium or fine-toothed comb.