Not every two days, not every four days: how often should you wash your hair, according to a dermatologist?

Do you have an oily scalp? Work out daily? Commute on public transportation? Live in a hot climate? Washing three to five times a week may be necessary to prevent buildup and discomfort. On the other hand, if your hair is dry, coily, or curly, you may be able to go longer between washes — as long as you use nourishing products suited to your hair type.

What matters most isn’t the exact number, but how your scalp feels. Itching, heavy roots, lingering odors? These are often signs that an extra wash could help. As the Hair Transplant Institute points out, your hair routine also depends on the products you use, your styling habits, and your overall lifestyle.

Spacing Out Shampoos Too Much: A False Good Idea

You may have heard that you should “train” your hair to stay clean longer. In reality, spacing washes too far apart can backfire: oil buildup, discomfort, dandruff, and a sensitized scalp can all result. Over time, this unbalanced environment may weaken your hair.

Your scalp is skin, after all. Just like the skin on your face, it needs regular — gentle — cleansing. Using the right shampoo at the right frequency actually helps maintain a healthy foundation.