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Does shaving make hair grow back thicker?

No. This was tested as far back as 1928 and again in the 1970s, with the same result each time. A razor cuts the strand at the surface and never touches the follicle, which is the only thing that decides thickness.

Watch the answer29s · Leon Ren, founder
Transcript

Shaving makes it grow back thicker. Every teenager believes it. It was tested in 1928 and again in the seventies. Same result. A razor cuts the strand at the surface and never touches the follicle, which is the only thing that decides thickness. What you're seeing is the blunt tip, a hair that tapers naturally looks fine. Cut it flat and the same hair looks coarse.

What you are seeing is the blunt tip. A hair that tapers naturally to a fine point feels soft; cut it flat and the same hair feels coarse. Nothing about the hair changed except its end.

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