Healthy Hair Tip: Make sure hair is COMPLETELY dry before using a curling/flat iron. The Journal of Cosmetic Science has some pretty horrible pictures of what happens to the hair cuticle if you use a hot tool when hair is wet. The cuticle gets cracked, split and blisters up. And once you do damage like that, there's no fixing it. Be careful, kittens!
Picture
On the left is a healthy hair strand. On the right is a damaged hair strand. The cuticle is lifted and shattered. This is similar to the photo of what hair looks like after curling hair when wet.
Image: Google Images
References: Journal of Cosmetic Science: Effects of thermal treatments with a curling iron on hair fiber

 


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