I went for a period of about 6 months without using shampoo, I only used a natural conditioner. I have really curly, frizz prone hair naturally. I usually straighten it, but for this 6 month period I left it curly, and my hair was so much healthier curly, hardly any frizz, unlike when I would shampoo. It took a while to get used to, but felt amazing in the end. It never smelled, I'd give my scalp a really good massage. Only reason I went back was because I prefer my hair straight, and with straightening every day or two, it would get very lank very quickly without shampoo.