It is essential to wear sunscreen every day, regardless of how cloudy it is or how little time you'll be exposed to the sun - it's even valuable to wear it on days you spend entirely indoors. Wearing SPF daily dramatically reduces your risk of developing skin cancer, one of the most prevalent types of cancer in the U.S., as well as protects you against premature aging.
SPF stands for 'sun protection factor,' which measures how much solar energy a particular product can protect your skin from. 'SPF, or sunscreen, is a product formulated to protect your skin from the damaging UV rays emitted by the sun,' Yadav explains. 'It is not an indication of how long a product can protect your skin from the sun.'
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