While some people put oil in their hair overnight, one to two hours is generally plenty. If you use more fat than you need, assuming you'll need to cover every strand of your hair, you'll need the same quantity of wash to remove it. Dryness may result, which is unhelpful. However, not everyone should oil their hair. Oiling should avoid by those who have dandruff, seborrheic dermatitis, or psoriasis since it may cause flaking and dandruff to adhere to the scalp. It may also cause red spots, irritation, inflammation, and other symptoms.