I don't know if you already do this or not, but I would highly recommend deep conditioning every time you wash. Even a two minute mask will work wonders over the long term when it comes to moisture retention. I make sure to diligently do so during the dry Winter months. HTH
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Favorite products:
Shampoo: KC Come Clean
Conditioner: Tresemme Naturals
Styling: Donna Marie Dream Curling Cream, EcoStyler Gel (pink)