Will I need to use the Double Effect Caffeine Shampoo in the long term?

Basically yes. Due to the product's dual action, i.e. the simultaneous effect against dandruff and hair loss*, the shampoo prevents hair loss*, maintains the hair and removes pesky dandruff. Both causes are sustained, which means that the predisposition as well as the risk of skin irritation and dandruff due to microorganisms and sebum will remain for life.

*without a result of a medical condition