The most significant bonus for me is that the Lisse Design Keratin Therapy Treatment is formaldehyde and paraben-free and conforms to international and European health standards, making it 100% safe (for both clients and the stylist). Lisse Design is not a reconstructive treatment, but is designed to replenish the hair, containing Keratin to strengthen and collagen to calm frizz, smooth curls and enhance shine. While the treatment does have a slight straightening effect, it doesn't contain harsh chemicals that break down the hair bonds permanently. It penetrates the hair to repair it internally, which is why a course of treatments can be beneficial. It can save up to 60% of blow dry time and lasts 2-2.5 months, when the Lisse Design sulphate-free shampoo and conditioner are used to maintain the results at home.