a principal scientist from Gillette has told MailOnline why they are shaped the way they are, why the number of blades is so important and what the lubricants bars, or 'lubebars' are really made of.
"During the shave, the strip and lubebar get "activated" by water and these long molecules get released from the strip and the lubebar,' Dr Vanoosthuyze added.
'They swell in water, stretch and align, creating a cushioning, lubricating and protective layer between the blades and the skin.
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