Sulphates — sodium lauryl sulphate (SLS) and sodium laureth sulphate (SLES) — are surfactants that create lather by aggressively binding to oil and washing it away. For dry, damaged, or colour-treated hair, they strip not just product buildup but the natural sebum and lipids your hair shaft needs to stay hydrated. The irony: the squeaky-clean feeling after an SLS shampoo is often your hair telling you it's been over-stripped.

Most people apply conditioner, massage briefly, and rinse within 30 seconds. Conditioner needs time to penetrate the hair cuticle. Emollients and conditioning agents (like cetrimonium chloride and behentrimonium methosulfate) require 2–3 minutes minimum to smooth the cuticle, deposit moisture, and reduce friction between strands. Rinsing too early means most of the product goes down the drain before it's done anything useful.

Hard water — water with a high mineral content (calcium and magnesium) — is one of the least discussed causes of chronic dry, dull hair. Minerals in hard water deposit on the hair shaft, making it rough and porous. They also interact with shampoo ingredients and reduce their effectiveness, meaning you need to use more product to feel clean, which strips the hair further. If you've moved to a new city and your hair suddenly changed, water hardness is often the culprit.

Hot water opens the hair cuticle aggressively and removes natural oils far more efficiently than warm water. A hot shower feels indulgent, but for your hair it's the equivalent of over-exfoliating your skin — you're dissolving the protective lipid layer that keeps moisture inside the shaft. Washing with warm water and finishing with a cool rinse (which closes the cuticle and adds shine) makes a significant, immediate difference to how your hair feels when dry.

Fine hair and thick, coarse hair have completely different conditioner needs. A rich, heavy conditioner designed for afro-textured or very dry hair will weigh down fine hair, make it greasy at the roots, and paradoxically make it feel lifeless and limp — which people often confuse with dryness. Conversely, a lightweight conditioner on very thick or textured hair won't provide enough slip or moisture to make a meaningful difference. Match the weight of your conditioner to the density and texture of your hair.

Shampoo and conditioner maintain your hair between treatments. They're not designed to reverse significant dryness, damage, or porosity on their own. A weekly deep conditioning mask, hair oil treatment, or bond-repairing treatment delivers a concentrated dose of proteins, lipids, and moisture that regular conditioner can't match. Think of it as the hair equivalent of a restorative face mask — the intensive contact time allows ingredients to genuinely penetrate and repair.