What does perm do? Make it curly or wavy??
How would that help me?
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That could be a
Choice for the outcome of the perm.
But the main reason, is that it weakens the hair fiber some what, so you can style it more easily.. more texture and volume
The secondary reason, would be to add certain directionality for easier management into the style you want.
____ For example, if your hair pulls to the left, but the style you want goes to the right, or straight up, or up and back, a Perm can make a hard shift in the direction of the hair to get into that shape.