Does sunscreen fully protect you from the sun? Higher SPF numbers mean greater protection from UVB rays. But no sunscreen can block all UVB rays. For example, a sunscreen with an SPF of 30 blocks about 97% of UVB rays. A sunscreen with an SPF of 50 blocks about 98% of UVB rays.
Does sunscreen protect you 100%? The SPF rating only refers to UVB rays. An SPF 15 sunscreen blocks 93% of UVB radiation, and SPF 30 blocks 97%. After that, the difference in protection is small. SPF 50 blocks 98%, and SPF 100 stops 99% of UVB rays from reaching your skin.
Why do I still get sunburned with sunscreen? Do you wear sunscreen, but still get sunburned? You might be using it incorrectly. “The biggest thing I see with patients is that they are not applying enough sunscreen and they aren’t reapplying it,” says David Harvey, M.D., a dermatologist and Mohs surgeon at Piedmont.
Can sunscreen protect your skin all day? The bottom line
Ultraviolet rays increase your risk for skin cancer and skin aging, and you are exposed to them every day. Over time, this sun damage starts to add up. Using sunscreen every day can help protect you from skin cancer and skin changes.