They look otherworldly — like a Star Wars Stormtrooper’s helmet — and promise to give you clearer, smoother-looking skin. LED light masks are exactly what they sound like: devices illuminated by LED ...

If you’ve spent any time on TikTok, you’ve probably seen an influencer make an ad for LED teeth-whitening kits — the little mouth-guard-shaped devices that you pop into your mouth and that claim to ...