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    1. Are these derma rollers bad/ineffective? Bought this just a few days ago and today I was watching a YT video where the guy said that these stainless steel ones can be more harmful and that the ones with titanium needles should be preferred. So should I buy a titanium one or am I okay with these? Reddit · 27 Jul 2026
    2. How to properly use a dermaroller Reddit · 4 Jun 2021
    3. Metal particles abraded from dermapen (or dermaroller) needles. Is it possible? Reddit · 11 Nov 2020