Most effective: Large, flat areas similar to arms and legs. Least effective: Curved areas love the underarms, and cause significant trauma into the face together with other thin skinned areas. Always store your hair cutting tools in a salon shear case or holder. https://maps.google.ae/url?q=http://www.kantarworldpanelportugal.com/10-essential-hairdressing-tips-for-stunning-styles-every-day/