How does the Norwood Scale work? It simply shows what minimal, medium, and maximum hair loss looks like, helping men figure out if – and when – to stop it.

It might seem as if someone experiencing male pattern baldness, the most common form of hair loss, would be aware of it happening. But like weight gain and cognitive decline, it actually comes on gradually, unnoticed in the earlier (and most preventive) stages. Perhaps only when a barber or hair stylist suggests changing how the…