During the treatment, the stylist distributes the product through the lengths and then works through the hair with straighteners. Under high heat, the active ingredients work within the hair structure, while some of the formula is sealed onto the surface, smoothing the cuticle. As a result, frizz is reduced and curls become looser, leaving the hair smoother and straighter. How noticeable the effect depends on the product formula and the temperature used during the treatment.