How often you should use a scalp treatment will vary from person to person, depending on their unique condition. The best to figure out how often you need to do the treatment is to apply it already once and see how your scalp feels during the days after. If it gets better but you still feel the itch then it may be good to re-apply it already on your next wash. If the itch completely disappears already then you can consider doing it again next time your scalp feels dry and itchy again. If you are re-balancing your scalp you may need to do it often for a while and when your scalp is healthier you'll be able to space the treatments or even completely stop it :)