Thanks To Its Millions Of Receptors, The Scalp'S Nervous System Is Exposed To Multiple Stimuli And Detects Even The Slightest Changes In Our Environment. These Include Friction Caused By Wiping With A Towel, Repeated Brushing & Combing, Straining Caused By Accessories Such As Tweezers, Hot Air From The Hair Dryer And Contact With Products That Are Not Suitable For The Scalp. .