Eliminate frizz and add strength and shine with the latest Brazilian straightening method. The Lasio system is non-damaging, even for chemically-treated hair. Hair can be washed after 24 hours and results last 3-4 months. Contains only .02% formaldehyde, the lowest percentage of any straightening treatment. Beverly Hills stylist Aline Cholakian is one of the only L.A. stylists using the Lasio system.