Sunscreens protect the skin against sunburns and play an important role in blocking the penetration of ultraviolet (UV) radiation. However, no sunscreen blocks UV radiation 100 percent.
Terms used on sunscreen labels can be confusing. The protection provided by a sunscreen is indicated by the sun protection factor (SPF) listed on the product label. A product with an SPF higher than 15 is called a sunblock.
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