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Sunscreens protect the skin against sunburns. Sunscreens also play an important role in blocking the penetration of ultraviolet (UV) radiation, which damages the skin and can lead to skin cancer. However, no sunscreen blocks UV radiation 100 percent.
The terminology 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 sunblock is considered to be any sunscreen with an SPF of 15 or more. In theory, sunscreens protect an individual during an incident of ultraviolet B (UVB) radiation exposure according to the following:
A sunscreen protects from sunburn and minimizes suntan by reflecting UV rays. Using sunscreens correctly is important in protecting the skin. Consider the following: