A massage brush is a specialized hair care tool, usually made of silicone. It's designed to gently massage the scalp, stimulate circulation, remove dead skin cells and dandruff, and thoroughly cleanse the scalp by removing oil and product residue. These brushes have flexible bristles that are soft enough not to damage the scalp, yet effective for deep cleansing. They can be used while shampooing or for self-massage with hair oil.