It's best to use a combination: lukewarm water to open cuticles for a deep clean, then a cold water rinse to seal them, locking in moisture and shine, though some prefer cold water for color preservation and less oiliness; hot water strips oils, while very cold water can be too harsh, so a balanced approach with lukewarm during washing and cold for the final rinse is ideal for most hair types.
Washing your hair with hot water has its advantages. Higher temperatures open pores, allowing shampoo and other products to penetrate the scalp more effectively. “Washing your hair with hot water may help remove dirt, grime, product, and oil more effectively than cold water.”
Washing with cold water will make your hair dirtier, but also can affect the blood vessels. Cold water causes a shock to the blood vessels, they close and can give you a headache (this process can go even further when your heart rate increases and the blood pressure goes up).
You need a temperature that's high enough to deep clean dirt and grime, but not so high as to cause irritation. Just above body temperature is perfect– so around 100F. It's the ideal balance to keep your hair clean and healthy and your scalp free from irritation.
Healthy hair care tips from dermatologists
Before you reach for your shampoo, make sure your hair is thoroughly saturated with water. For best results, use lukewarm water. Overly hot water can strip away your hair's natural oils, leaving it dry, brittle, and prone to damage.
If you shower less frequently, dead skin, dirt, product residue, and sweat may also build up on your scalp. This can result in greasy hair, increased risk for infection, and unpleasant odor.
The short answer is yes—hot water can be bad for your hair. Hot water strips your hair of its natural oils, which can lead to dryness and even make your hair more prone to breakage. The heat opens up your hair cuticles, which, although it helps with cleaning, can also leave your strands more vulnerable to damage.
This is because cold water closes the hair cuticles and pores in the scalp. This process adds luster and shine to the hair as the cuticles have been closed. It helps in sealing in the hair's moisture and also helps in clumping your coils and curls together for even more definition.
If you would like your hair to look shinier and healthier, we highly recommend using distilled water instead of your regular tap water. Distilled water is pure and free from any hard mineral build up or harsh chemicals like chlorine. This makes distilled water an excellent addition to your hair care regimen.
Not too hot, not too cold
The gist is that lukewarm water is best for shampoo, and cool water is best with conditioner, and as a final rinse.
When you're ready, submerge your head first to get your hair wet enough to apply shampoo then quickly step out from under the shower. Shampoo your hair quickly to minimise how long your hair is soaked in cold water, then pop your head back under and rinse it clear of the shampoo.
Hot Water Can Especially Be Harmful In Winter
Winter already reduces moisture in the air. Your scalp can also lose hydration faster. Additionally, if you wear woollen caps, don't oil your hair much, and opt for hot showers, the damage can gradually increase. That's why winter hair fall is so common.
Cold Water Helps Reduce Frizz and Moisture Loss
While cold water doesn't permanently seal cuticles, it reduces swelling in the outer layer and helps your hair hold onto hydration longer. This effect leads to fewer flyaways and more manageable hair, especially for those prone to frizz or dry ends.
Improved Curl Definition:
The cold water closes the hair cuticle, which can enhance your natural curl pattern.
Extremely hot showers can strip off the natural oils from your scalp causing it to become extremely dry and flaky. Instead, use lukewarm water or cold water to maintain your scalp's moisture level. Use a sulphate and paraben-free shampoo to rinse off your hair properly to prevent irritation and dandruff.
You need a temperature that's high enough to deep clean dirt and grime, but not so high as to cause irritation. Just above body temperature is perfect – so around 100°F. It's the ideal balance to keep your hair clean and healthy, and your scalp free from irritation.
The cold constricts cuticles, trapping moisture inside hairs to boost shine, smooth flyaways, and protect delicate ends from accumulating split damage after styling sessions. Frequent cold finishing also stimulates scalp circulation for healthier follicle growth cycles.
Focus on your scalp—not your ends. Use your fingertips (not your nails) to gently massage the shampoo into your scalp in circular motions. This helps remove buildup and boosts blood flow to the area, which can support healthy hair growth. Let the lather work its way down your hair as you rinse.
The "Big 3" hair loss treatments, popular in forums, are Minoxidil, Finasteride, and Ketoconazole shampoo, often combined to tackle hereditary hair loss (androgenetic alopecia) by boosting growth, blocking hormones, and reducing inflammation. Minoxidil (Rogaine) widens blood vessels, Finasteride (Propecia) blocks DHT, and Ketoconazole fights scalp fungus and inflammation, with microneedling sometimes considered a fourth addition.
Hair loss can signal deficiencies in nutrients like iron, Vitamin D, Zinc, Biotin (B7), B12, and even Vitamin C, as these support follicle health, oxygen supply, and keratin production, but it's crucial to see a doctor for blood tests to confirm which nutrient you're lacking, as excess vitamins (like A or Selenium) can also cause hair loss, notes Harvard Health and The Hairy Pill.
10 hair care habits that can damage your hair
Understanding how to know if your hair is damaged means learning the visible and invisible signs: dryness, breakage, tangles, dullness, or loss of elasticity. By pairing nourishing products with protective habits, you can restore your hair's natural strength and shine — and keep it healthy for the long term.
While rinsing off pollution may be a practical reason for daily hair washing, for many Koreans, maintaining clean and styled hair also ties into beauty standards and social expectations — factors that can directly impact one's image.