“Keratin is a naturally occurring protein within the hair, and keratin therapies, generally, are designed to semi-permanently make the hair straighter, softer, and shinier” explains Vernon François, celeb hairdresser, educator, and founding father of Vernon François Haircare; international inclusivity and training advisor for Kérastase; and international advisor, educator, and celeb hairdresser for Redken. “There are differing kinds that adjust in depth, substances, required time, utility course of, and value.”According to Los Angeles–primarily based hairstylist Sophie Rose Gutterman, a daily keratin therapy will usually final anyplace between three and 6 months (relying on at-home maintenance, way of life, hair texture, and so on.) whereas an categorical therapy can final anyplace between six weeks and three months, relying on the identical varieties of components. Another cardinal rule of keratin therapies? Steer away from water and ponytails for 3 days, minimal, as they’ll bend and add texture to freshly relaxed strands.Additionally, it is vital to make the differentiation between smoothing therapies (like Goldwell Kerasilk), which additionally include keratin however are much less potent, formaldehyde-free, and extra geared towards frizz, and straightening therapies (like Brazilian Blowout) that are stronger, harsher on the hair, and actually iron out the feel. In different phrases, be sure to speak to a stylist you belief and guarantee what you are really getting earlier than diving headfirst on the salon.