Your karaoke version of “I’m Coming Out” would make Diana Ross clap with pride.Too bad your attempts to rock her wild mane would make her puke.Oh, well. Give your frizz a disco nap with Twilight Salon’s new Brazilian Blowout, a quicker, milder version of keratin treatments past.Forgoing formaldehyde (about time), the process leaves strands smooth and shiny— but not lifelessly straight. First, three washes using a detoxifying shampoo leave locks squeaky clean. Then they’re coated in half-inch sections with a chocolate-smelling solution before getting the once-over with a flat iron, moisturizing mask, and final blow dry.Everything takes about two hours and, unlike similar treatments, you can shower right away. But the big news: For up to twelve weeks, your hair will be no fuss, no muss.You’ll want the world to know.Available at Twilight Hair Salon, 849 Beacon Street (617-859-4940 or twilighthair.com).