1. After the hair on the face is shaved off, the roots usually appear thicker because the razor cuts the ends of the hair, leaving behind thicker roots.
2. Shaving does not change the growth rate or final thickness of hair, which is mainly determined by genes.
3. Newly grown hair may give people the illusion of thickening, but in fact, it is because the tips of the hair are thinner than the roots, and when scraped off, the thicker roots are visible.