How to Use Dr. Groot Hair Thickening Serum
Dr. Groot Hair Thickening Serum is applied directly to the scalp, not along the hair lengths: unlock the roller, prime it, dispense a small amount, roll over thinning areas, massage briefly, and lock the applicator. The leave-in serum works on damp or dry hair, but a clean, mostly dry scalp gives the most controlled application. […]