Are you supposed to wash your hair twice in one go?

No, you are not supposed to wash your hair twice in one go. Washing your hair twice can strip it of its natural oils, leading to dryness, damage, and scalp irritation. It is generally recommended to shampoo your hair once during a shower, and then condition it afterward. If you have oily hair, you may need to wash it more frequently, but it is still best to avoid washing it twice in a row.