It cleanses and purifies the scalp, fighting against microbial attacks and creating a healthy and clean environment.How to use:Apply 20 gr. of product to the scalp with damp hair and massage in, especially on those areas most affected. Leave on for a few minutes. Rinse off thoroughly. Intensive treatment: twice a week for maximum 3 weeks. Maintenance treatment: once a week for 6 weeks. The maintenance treatment can be interrupted earlier than 6 weeks if the problem has been resolved.