Imperial College Expert: Beards Aren't Dirtier Than Clean-Shaven Faces
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- John Tregoning, professor of vaccine immunology at Imperial College London, argues the idea that beards are less hygienic than clean-shaven faces is overblown and not well supported by science.
- A 1967 study recovered the most bacteria from unwashed clean-shaven faces, followed by unwashed bearded faces, washed bearded faces and finally washed clean-shaven faces — meaning unwashed shaved skin was the dirtiest combination tested.
- Tregoning concludes that if you skip washing, having a beard is actually better, though washing a clean-shaven face removes slightly more bacteria than washing a bearded one.
- Research on surgeons and healthcare workers has produced mixed results on whether facial hair raises infection risk in operating theatres, with most studies finding no meaningful concern when masks are worn properly.
- Perception lags the evidence: one cited study found restaurant customers rated waiters with facial hair as dirtier, illustrating the cultural bias the science does not back up.
- Tregoning's bottom line is that bacteria live on all skin, hairy or not, and are generally harmless — "it's not really a problem unless there's an open wound."
Why it matters: The 1967 study inversion — unwashed clean-shaven skin carrying more bacteria than unwashed bearded skin — directly contradicts a folk belief that still shapes grooming norms in hospitality, healthcare and hiring. For industries that have historically restricted facial hair on hygiene grounds, the science as cited offers a concrete reason to revisit the policy assumption.
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