Cold water showers help the hair retain its moisture, so when you're brushing and styling, it's much more resistant to breakage. By stiffening up the cuticle, cooler temperatures ensure that follicles become more manageable. Jessie Cheung, MD, tells Health that cold water "will flatten the ruffled cuticles and lock in moisture to prevent breakage."
Particularly when it comes to conditioning, rinsing with cold water is imperative to locking in your wash's benefits. Kally Papantoniou, M.D., a dermatologist with Advanced Dermatology PC, told SELF that, "Using warm water can dissolve lipids and remove most of the conditioners that you added in." So, if you spent a half hour doing a deep condition, only to rinse with hot water, you could be losing nearly all of the benefits. Since warm water opens the shaft, the nutrients your hair just absorbed can quickly fall out with a warm rinse.
Bottom line: Stick with cooler water if you have color-treated hair and when conditioning at the very least. Your vivid color and enhanced softness will be worth it!
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