Dermatologist Shereene Idriss says forget the every-two-hours rule and the all-day myth. Reapply sunscreen only when you're in direct sun, sweating, swimming, or toweling off. Most people underapply by 50%, so a generous morning coat beats a thin midday touch-up.
Can we please stop pretending that sunscreen is either every 2 hours or we implode, or just once a day and good luck? Because both are BS. The sunscreen conversation has gotten pretty dumb. One side is telling us we have to set a timer and reapply every 2 hours, even if we're sitting in a windowless office all day. The other side is saying slap it on at 7 AM and you're covered until midnight. But neither is how it works. If we're outside in direct sunlight, we reapply. If we're sweating because sweat breaks down the protective film, we reapply. If we're swimming, toweling off, rubbing our faces all day, we reapply. And if the UV index is high, especially above 3, and you're getting real sustained exposure, we reapply. But if we're indoors most of the day, not sitting next to a sunny window, not sweating, not touching our faces, or the UV index is less than 3, your sunscreen is probably still doing its job from your morning application. But here are two caveats. One, if you have a pigment condition like melasma, your threshold is lower and reapplication is more necessary. And the bigger issue— most of you are underapplying by 50%, and a proper first application with enough product does more than a thin midday touch-up. Wear the damn sunscreen, apply it properly in the morning, and just be smart about when actually need to re-up it instead of living fearfully.
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