PurePlenty Shampoo and Conditioner should be used daily with the Serum used twice daily as recommended for best results. If you stop using PurePlenty your hair and scalp may resort to its pre-PurePlenty state. If you do not normally wash and condition your hair each day that is okay as long as you do not start to see build up or dryness on scalp and strands. Adjust frequency of shampoo and conditioner to meet your lifestyle. However, the serum should be used twice daily for best results.