The exfoliation brush is our least expensive product, but it's one I'm proudest of, and probably the one I spent the most time developing. I worked with a Boeing engineer in Pennsylvania and designed it from scratch.
One of the biggest misconceptions people have when they first notice thinning hair is that they should be more delicate with their scalp. Treat it gently so they don't "make it worse." It sounds logical, but it's the opposite of what your scalp actually needs.
Think of the brush like a toothbrush for your scalp. As you use it, you're vigorously massaging the skin, increasing circulation and blood flow to the follicles. At the same time, you're removing built-up dead skin, dandruff, and sebum that clog the follicle openings. And critically, you're opening up the epidermis so that the active ingredients in the shampoo (and, later, the topical) can actually penetrate and reach the follicle where they're needed.
Without proper scalp exfoliation, even the most potent shampoo is just sitting on the surface. The brush is what unlocks the rest of the system.