"I have one client who came on Saturday and she said, 'Yoann, you cut my hair almost a year ago, and I still love the way it looks.' With a good cut, the hair can still look healthy six months to a year later. The thing to keep in mind is that the layers around the face — around the cheekbones or the jawline — are going to fall. If you let it grow out for a year, that volume might now be down around your shoulders."