This advanced dry shampoo helps remove oil, sweat, and odors while adding softness and natural shine for that fresh-out-of-the-shower feel. Give hair that's already in good shape a full-on doctorate with Perfect hair Day (PhD). The PhD collection delivers the five hallmarks of healthy hair -smoothness, volume, conditioning, strength, and polish - all while helping strands stay cleaner for longer. This advanced dry shampoo helps remove oil, sweat, and odors while adding softness and natural shine for that fresh-out-of-the-shower feel. Give hair that's already in good shape a full-on doctorate with Perfect hair Day (PhD). The PhD collection delivers the five hallmarks of healthy hair -smoothness, volume, conditioning, strength, and polish - all while helping strands stay cleaner for longer. Dubbed "the Meryl Streep of hair care" by Allure, Living Proof offers a diverse, award-winning collection of products that optimize the styling and health of your locks. Led by a team of world-renowned biomedical scientists and veteran stylists, the brand applies advanced technology to beauty challenges - and makes bad hair days a thing of the past.