Pennslyvania-based board-certified dermatologist Erum Ilyas tells Allure that single-blade razors like this are great for sensitive skin types or anyone who has a tendency for ingrown hairs. "With a single blade, the likelihood of ingrown hairs is reduced," she says.
Double-edge safety razors are also more environmentally friendly because the blades can be recycled easily as plain metal (and of course cheaper to buy too).
See Why I’m Never Going Back to Multi-Blade Razors Again
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The Hanni Weighted Razor has shown me the power of the single-blade razor.