Keratin vs. Japanese Hair Straightening The Japanese hair straightening treatment (a.k.a. thermal reconditioning) is permanent -- it actually changes the internal structure of your hair, removes all curl to create pin-straight strands and may damage hair. It's also not very popular anymore. "Japanese doesn't fight frizz or cut blow dry time in half," says Rosado. "It just straightens your hair."
Comparatively, keratin treatments only last three to six months (depending on the product used and your lifestyle). They will not straighten -- only soften -- curl (though they will straighten waves). However, they do eliminate frizz and can make hair healthier over time.
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