"For shine that lasts, make sure that your hair is hydrated so the light bounces off it," says NYC stylist Ouidad. Deep condition twice a week for best results.
Blow-dry hair on a medium heat setting and finish with a shot of cool air to seal the cuticle.
Spritz with a thermal protectant spray before flat ironing to keep hair healthy. Make a deep side part, once you've gotten your hair as sleek as possible.