Kerastase Specifique Bain Exfoliant Hydratant is designed especially for those suffering from scalp and dandruff problems. Bain Exfoliant Hydratant is designed for sufferers of DRY DANDRUFF. This specialist formula shampoo will help hydrate the scalp and hair, increasing moisture levels, preventing dandruff. There are two types of dandruff caused by two different things. Dry dandruff, which spreads over the hair and falls easily onto shoulders is caused by environmental factors and stress. The second type of dandruff is greasy dandruff, this sticks to the hair and develops in warm, humid areas. How to use K?rastase Specifique Bain Exfoliant Hydratant As an intense treatment Apply Bain Exfoliant to dry hair, then massage into scalp in a circular motion for about 4 minutes. Rinse, then reapply to wet hair. Leave for 2 minutes, massage into scalp for 4 minutes, then rinse. As a daily treatment Apply Bain Exfoliant to wet hair, then leave for 2 minutes Massage into scalp for 4 minutes. Rinse thoroughly.