Flat hair whispers, while voluminous hair shouts, so let her hair do the talking! With  L'Oréal Professionnel's latest line, Tecni.Art, you can add volume and shine to your client's tresses worthy of the catwalk! This new styling line is used backstage at Fashion Week to create the looks that can survive endless strides down the runway without losing their volume, hold or shine! And now, it's available in the United States! To style these voluminous curls, L'Oréal Professionnel Artists Jennifer MacDougall and Eric Gomez used Tecni.Art Volume Envy Extra and Extreme Lacquer to add the perfect amount of bounce and shine to…