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Is air-drying really better for your hair than blow-drying?
Air-drying isn't automatically safer: your hair stays swollen and vulnerable for hours, and in lab research it was actually air-drying that damaged the glue layer inside the hair fibre. Here's...
Does heat protectant need to dry before you start styling?
With a straightener or curling iron, let your heat protectant dry first: water in your hair boils inside the hair fibre and lowers the temperature at which keratin breaks down....
Does cold water really close your hair cuticles? Here's what actually happens
No: hair cuticles are dead keratin cells without muscles and don't respond to cold water. Water and pH move your cuticles, a cold rinse gave no extra shine in testing,...
Is the temperature on your straightener or airstyler accurate?
The number on your display is the temperature of the plates or of the airflow, not of your hair. How big that gap is, why the temperature fluctuates while you...
Does the glass of water hair porosity test actually work?
No, the glass of water test does not measure your hair porosity: whether a strand sinks or floats comes down to surface tension and product residue. Here you'll read what...
Is one pass at 200 degrees worse than three at 150 degrees?
One calm pass on a higher setting is usually less damaging than several passes on a low setting, because heat damage adds up. Here is how to find the lowest...
How long should you let a curl cool before you touch it?
A curl sets while it cools, not while it heats up. Count on 30 to 60 seconds per thin section cooling in your hand and 5 to 10 minutes if...
Is Hygral Fatigue Real, or a Myth? What Actually Happens to Wet Hair
A closer look at the science behind hygral fatigue: what's proven about wet hair, what's borrowed from wool research, and what actually causes lasting damage when your hair is wet.
