It is normal to lose 100 hairs a day. These hairs will regenerate on their own. If the hair loss is due to genetics and aging or to a severe trauma to the head, then no, it probably will not grow back. Any other cause of hair loss garners the opportunity for hair regrowth. Use Phytocyane shampoo , Phytocyane Densifying Treatment and Phytophanere vitamins to accelerate the rate of growth and strength of the new hair coming in.