If frizz, puffiness or stubborn waves are running your mornings, you’ve probably heard of both Japanese hair straightening and keratin treatments. They’re often mentioned in the same breath, but they’re very different services with very different results. Here’s how to tell which one fits your hair and your routine.
The short answer
Choose Japanese straightening if you want hair that stays straight every day, through washing and humidity, with almost no styling.
Choose a keratin treatment if you want smoother, shinier, less frizzy hair that still keeps some natural movement and body.
What is Japanese hair straightening?
Japanese straightening — also called a straight perm, thermal reconditioning or the TR Process — is a chemical service that permanently changes the structure of the hair it’s applied to. A solution softens the bonds that create wave and curl, then the hair is flat-ironed in small sections and a neutralizer locks the straight shape in place.
The treated hair stays straight until it grows out or is cut. As new hair comes in at the roots, you book a touch-up on the regrowth only, starting about six months after your treatment. Very curly hair usually needs a touch-up every six months; hair with less curl may only need one once a year.
What is a keratin treatment?
A keratin treatment smooths the outside of the hair instead of restructuring it. A smoothing formula is applied and sealed in with a flat iron, which calms frizz, softens texture and adds shine. Your hair is easier to blow-dry and behaves better in humid weather, but it isn’t made pin-straight.
Keratin results fade gradually as you shampoo, so most people repeat the treatment every few months.
Side by side
Result
Japanese straightening gives sleek, straight hair. Keratin gives smooth, frizz-free hair with softness and movement.
How long it lasts
Japanese straightening is permanent on the treated hair; you only maintain the regrowth. Keratin gradually washes out over a few months.
Time in the chair
Japanese straightening is one of the longest salon services: plan for about 3 to 5 hours, depending on your hair’s length and thickness. Keratin is usually quicker.
Going back
Once hair is straightened with a Japanese treatment, that hair won’t return to its natural curl. If you might want your waves back, keratin is the more flexible choice.
Hair condition
Japanese straightening isn’t always safe for heavily bleached, recently lightened or damaged hair. Keratin is often an option for color-treated hair. Either way, your stylist should check your hair first.
Aftercare for both
Wait before washing your hair. For Japanese straightening, that’s 2 days; for keratin, your stylist will tell you what your formula needs.
Skip tight ponytails, clips and headbands, and don’t tuck your hair behind your ears. After Japanese straightening, keep this up for about a week so the hair doesn’t get dents or marks.
Use a gentle, sulfate-free shampoo and conditioner to make results last.
Still not sure?
That’s what a consultation is for. At Hair Pro Charming in Woodside, Queens, we look at your hair’s texture, history and the look you want, then recommend the right service. Learn more about Japanese hair straightening and our Brazilian keratin treatment, or send us a booking request.