"If used properly, sunblock is very effective at preventing the harmful effects of the sun that may lead to both skin cancer and accelerated aging," says Dr. Sarah Weitzul, assistant professor of dermatology at UT Southwestern Medical Center at Dallas.
"Ultraviolet light, made up of ultraviolet A (UVA) and ultraviolet B (UVB) wavelengths, has been shown to cause mutations that lead to skin cancer in skin cells. Such mutations and other effects can be prevented by the use of sunblock," she says.
To get the most out of your sunscreen, Weitzul suggests the following:
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