Yuko Anti - Frizz is designed to control frizz and smooth hair. This is a perfect treatment for someone who doesn't want poker straight hair but simply wants to address frizzy and unruly hair. Yuko Anti - Frizz does not contain chemicals that produce formaldehyde which can be found in some versions of the Keratin Treatment. The treatment takes from 1.5 - 3 hours and will last around 3 months in the hair. Anti - Frizz can be used over any hair type regardless of previous treatments or damage. Unlike Yuko Straightening this treatment can be done on the same day as a colour treatment.