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In hot summer, many people are usually carrying a sunscreen, but when in use, some people have applied only once a day, and some people are constantly applied to the body, how long does the sunscreen applied once is scientific.

As the sunscreen form protective film requires a process, therefore, generally the best in the face, back and upper parts of the bare applied sunscreen 30 minutes later go out, try to avoid the sun in the UV rays are the most time (10:00 to 15:00) out. Easy sweating in summer, and easy to rinse sunscreen off, it should be applied once every two hours. When live in the strong sun environment, such as at the beach, that should be apply once every 30 to 90 minutes.

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