What is the difference between physical and chemical sunscreens? Why do I need to apply chemical sunscreens in advance?

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더나클리닉 · Accepted Answer

Physical sunscreens provide immediate protection by reflecting and scattering UV rays. Chemical sunscreens absorb UV rays and require time to adhere to the skin, so they should be applied 15-30 minutes before going outside to function effectively.

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What is the difference between physical and chemical sunscreens? Why do I need to apply chemical sunscreens in advance?

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