“Shaving your head makes hair grow back thicker and stronger”

The notion that shaving your head leads to hair growing back thicker and stronger is a persistent belief, often passed down through generations. This misconception likely stems from the visual and tactile changes experienced when hair regrows after being cut close to the skin. The initial regrowth can appear and feel different, leading many to assume a fundamental alteration has occurred in the hair itself.

However, scientific evidence consistently debunks this idea. Shaving only removes the visible part of the hair shaft above the skin's surface; it does not affect the hair follicle, which is responsible for hair growth, nor does it impact the root beneath the skin. Controlled studies, some dating back to the 1920s, have repeatedly demonstrated that shaving has no influence on the actual thickness, color, or growth rate of hair. The hair that emerges is genetically programmed to be the same as it was before shaving.

The reason this myth endures is largely due to an optical and tactile illusion. When hair is shaved, the cut end is blunt and coarse, unlike the naturally tapered end of virgin hair. This blunt tip can make the individual strand feel rougher and appear more prominent as it first emerges, creating the sensation and look of thicker, stronger hair. Additionally, the shorter, stiffer hairs are less flexible and can stand up more, contributing to the perception of increased density, even though the hair shaft's diameter remains unchanged.