Here's why:
* Hair growth happens at the root: Shaving only removes the hair shaft at the surface of the skin. It doesn't affect the hair follicle beneath the skin, which is responsible for hair growth.
* The illusion of thicker hair: When hair is shaved, it has a blunt end. This blunt end can feel coarser or stubblier as it grows back, creating the *perception* that it's thicker. Also, new hair hasn't been exposed to the sun or other environmental factors that can lighten the hair.
The thickness, color, and growth rate of your hair are primarily determined by genetics and hormones.