Does anyone have any suggestions for a brush that can thicken the hair I do have left? I still use an old vent brush I've had for over 20 years. I've noticed that when I sprinkle on Caboki hair fibers, I do get scalp coverage, but in certain lighting, there are clear bald lines where the brush goes through my hair. Is there some kind of brush that thickens hair or creates the illusion of thicker hair?