“Shaving makes hair grow back thicker”

It's a common belief that reaching for a razor will cause hair to return coarser, darker, and in greater abundance. This widespread misconception likely originated from simple observation, as people noticed immediate changes in the feel and appearance of hair after shaving, leading to the assumption that the act itself was altering hair's fundamental characteristics. This anecdotal evidence, coupled with cultural practices like shaving babies' heads to promote thicker hair, helped solidify the myth over generations.

However, scientific understanding of hair growth tells a different story. Hair is essentially a dead protein filament that emerges from a living follicle beneath the skin. Shaving only cuts the hair shaft at the skin's surface; it has no impact whatsoever on the follicle itself, which is responsible for determining hair's thickness, color, and growth rate. These attributes are primarily governed by genetics and hormones, not by external actions like shaving.

The illusion of thicker, darker hair after shaving stems from several factors. When a razor slices through the hair, it creates a blunt tip, unlike the naturally tapered end of virgin hair. As this blunt-tipped hair begins to regrow, it can feel coarser and more stubble-like to the touch, making it seem thicker than it actually is. Furthermore, freshly grown hair hasn't been exposed to sunlight, soaps, or other environmental elements that can naturally lighten and soften hair over time, causing it to appear darker and more prominent against the skin. The simultaneous regrowth of many hairs cut at once can also contribute to an impression of increased density.