Most women should wash their hair based on their hair type, lifestyle, and scalp condition rather than a fixed rule. For many, washing 2–3 times per week is a good baseline, as overwashing can strip natural oils and lead to dryness, while underwashing may cause buildup. Those with oily hair or who exercise frequently might need to wash more often, while people with curly, thick, or dry hair can usually go longer between washes. It’s best to use a gentle shampoo, focus on cleansing the scalp rather than the ends, and follow with conditioner to maintain moisture and manageability.