Disinfect the derma roller with medical alcohol before and after each use. Lightly wet and comb hair before use to prevent tangles. For longer hair, part hair in sections and using gentle pressure, roll the derma roller back and forth 5-10 times horizontally, vertically and diagonally. Temporary redness and minor discomfort may occur. For best results, spray the treated area with Dushi Rapid Hair Growth Serum after. Use once a day and no more than 2 times a week – do not use again until treated area has fully healed. Store the derma roller in the case provided. We recommend replacing your derma roller after 15 uses to ensure the needles remain sharp and precise.