Matrix Biolage 6-in-1 Smooth Proof Deep Smoothing Hair Serum Review! Hello beauties, Today’s review is on the Hair serum by Matrix, Biolage Smoothproof 6-in-1 Deep Smoothing Serum. Just using a shampoo and a good conditioner, does not give your hair the desired softness, or they are not manageable, in case if you have rough and wavy hair […]