Does Shaving Make Hair Grow Thicker?
No, shaving does not make hair grow back thicker, darker, or faster. This is a persistent myth. Shaving cuts hair at the surface, creating a blunt tip that may feel coarser. The hair shaft tapers naturally at the end; when cut flat, the blunt edge feels stubbly. Hair thickness is determined by genetics, not shaving.
Key Takeaways
- Hair grows from follicles beneath the skin surface.
- Hormonal changes, age, and certain medications can actually change hair thickness - unrelated to shaving.
- Waxing and plucking remove hair from the root, so regrowth starts with a natural tapered tip.
Explanation
Hair grows from follicles beneath the skin surface. Shaving only affects the dead portion of hair above the skin and has no impact on the follicle, hair growth rate, or hair thickness. Multiple scientific studies have confirmed this conclusion.
The illusion of thicker regrowth occurs because unshaved hair has a naturally tapered, fine tip from wear. When hair is cut straight across by a razor, the blunt end feels stubbier and appears darker because the full diameter of the shaft is exposed rather than a fine tip.
Hair may also appear darker simply because new growth has not been lightened by sun exposure, and shorter hairs stand up more stiffly than longer ones that lie flat. None of these factors indicate actual changes to the hair itself.
The definitive study on this topic was published in the Journal of Investigative Dermatology as early as 1928, and follow-up studies in 1970 and 2007 all confirmed the same result: shaving has zero measurable effect on hair thickness, color, or growth rate. Researchers measured hair strand diameter with calipers before and after repeated shaving cycles and found no statistical difference.
Human hair grows in cycles—anagen (active growth, 2-7 years), catagen (transition, 2-3 weeks), and telogen (resting/shedding, 3 months). Shaving only cuts the visible shaft and has no influence on these cycles. Follicle size, which determines strand thickness, is set by genetics and hormone levels. Testosterone and DHT are the hormones that actually make body and facial hair thicker during puberty, which coincidentally is when many people start shaving—reinforcing the false connection between shaving and thicker growth.
Things to Know
- Hormonal changes, age, and certain medications can actually change hair thickness - unrelated to shaving.
- Waxing and plucking remove hair from the root, so regrowth starts with a natural tapered tip.
- Individual perception of regrowth varies; expectation of thicker hair may increase awareness of stubble.
- Laser hair removal and electrolysis are the only proven methods that permanently reduce hair thickness by damaging the follicle itself.