Believe it: This clean, cutting-edge one-step bonding hair-repair treatment delivers professional-level results at home. Made with Bio-Diffusion™ technology to help restore damaged hair, the luxurious treatment works brilliantly for every hair type and texture. Founder Eric Pressly, PhD (a chemist with more than 100 patents in bond-repair technology) considers this his best invention yet. It comes with a reusable spray bottle plus two vials of concentrate; simply empty one vial into the spray bottle, then fill the rest of the bottle with water. Shake thoroughly before spritzing through dry, unwashed hair (spritz enough so that your hair’s completely drenched). Let it soak in for a minimum of 10 minutes—you can leave it on overnight, too—before shampooing and conditioning your hair as usual. Each vial lasts for about two to five treatments (use it once a week for best results) depending on your hair length, texture, and type. The results—silkier, softer, stronger, healthier-looking-and-feeling hair with noticeably less frizz—have to be seen to be believed.