Lovers of sleek and glossy hair, sing hallelujah: Keratin Complex straightening will make your mane tame and frizz-free for six weeks. The salon-based treatment (sometimes called Brazilian Keratin) coats strands, smooths frayed cuticles, and leaves hair shinier. “It transforms hair,” says N.Y.C. salon owner Valery Joseph. Best of all, unlike Japanese straightening, it won’t damage fragile, color-treated hair. To maintain results, use Keratin Complex Infusion Keratin Replenisher ($40; keratincomplex.com for salons).