Here's why:
* Hair Growth Originates at the Follicle: Hair thickness and growth patterns are determined by the hair follicle located beneath the skin's surface. Shaving only cuts the hair shaft at the surface; it doesn't affect the follicle.
* Tapered vs. Blunt Ends: When hair is shaved, it creates a blunt end. This blunt end might feel coarser or thicker as it initially grows out because it's not tapered like hair that has grown naturally or been cut with scissors. However, the actual thickness of the hair strand remains the same.
* Perception: The illusion of thicker hair can also be because all the hairs are the same length when they start growing back. This can create a denser appearance.
* Hair density: Some people have high hair density (many hairs per square inch), while others have low hair density. Shaving doesn't change the number of hair follicles on the scalp.
The perceived change is temporary and is due to the texture and appearance of the freshly cut hair, not an actual change in hair growth or thickness.
Factors that do influence hair thickness and growth include:
* Genetics
* Hormones
* Nutrition
* Age
* Health conditions