Optimizing scalp health leads hair to feel fuller, look thicker, and perform better as if re-established to a more luxurious, youthful, healthier head of hair. After beginning Actiiv Thickening Cleansing Treatment one can expect less hair damage, and thicker, fuller feeling hair starting in as little as 2-6 weeks. Actiiv Renew if you Heat style your hair, have color treated hair and notice lack of shine.