Davines Hairdressing Products NTECH MINI PRODUCTS Purifying Shampoo. Perfect treatment shampoo for scalps with both dry and oily dandruff problems. Eliminate any problems with this dandelion and selenium formulation. You can apply it as an intensive treatment for 3 weeks using it twice a week or as a maintenance treatment applying it once a week for 6 weeks. In addition, its natural components have numerous antioxidant and anti-inflammatory capacities that will pamper your hair to the maximum. Apply to damp hair with a gentle massage and then rinse with plenty of water.