The dawn of shaving is shrouded in mystery: no one quite knows its exact beginning, and its cultural meaning ebbs and flows with time and location. We do know, however, that the shaving ritual is long-standing, appearing in the far reaches of human history. In prehistoric cave paintings, men are depicted with shorn facial hair, using seashells to tweeze away beards one cuticle at a time, and shearing with shark teeth or roughhewn flint knives. While it’s easy to imagine…