It's simple to understand. Grind a thin layer, check the tip, and stop the moment the dark dot appears.
But I won't pretend it's instant. It does take a little patience, especially the first session or two while you and your dog find your rhythm.
The thing is, you really learn it by doing it, so try it once on a single nail and it clicks.
And so you're never left guessing, every order includes our Dark Nail Mastery Guide, a step-by-step walkthrough for reading the nail and mastering black nails for good.