Beauty most wanted: The straightening treatment

Ever since Health Canada red flagged Brazilian blowouts, finding a salon that offers the straightening treatment feels like undercover spy work. An accessible (and formaldehyde-free) alternative, Living Proof Straight Styling Hairspray ($34, at Sephora) is an aerosol version of polyfluoroester—the MIT-born hair-smoothing molecule that blocks frizz  in the face of humidity.