The only thing that brushing your hair may do is help stimulate the scalp which may aide in hair growth and certain brushes like boar bristle brushes help spread the natural oils from your scalp which can help nourish your hair. Brushing may also help get rid of tangles. You can also stimulate your follicles by doing scalp massages so you don’t need to brush your hair for this reason.

For curly hair brushing is NOT the best thing to do, curly hair responds better to gentle detangling using a comb, it is better for your hair because it doesn’t cause as much breakage. Curly hair tends to be a bit dry and brushing curly hair can cause a lot of damage in fact I never brush my hair when it is curly. You are getting frizz because by brushing your curls you are separating them and making them more fuzzy, to keep your curls nice and formed you should style your hair when it is wet, gently comb with a wide tooth comb, apply your leave in products and style as you like and then do not handle your hair until it sets and dries.

Not all hair types react the same to certain styling so some people may have hair types where brushing isn’t necessarily bad but curly hair and brushing isn’t usually a great idea. The more tightly curled your hair is the more damage brushing can do. If you do like brushing your hair be gentle and use a good quality brush but it will wreck your curly hairstyles.

Only brush your hair when your hair is wet!  I know it sound weird but that is the way to do the thing perfectly.