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Sunscreen: Are You Really Covered?

You know you should wear sunscreen every day. But what kind? How long can you keep it?

Get the answers to these questions and other truths about sunscreen.

Sunscreen: True or False

1. The higher the SPF, the better the protection.

FALSE. It sounds right -- a sun protection factor of 100 should be twice as protective as SPF 50. But it's only a few percentage points more effective. An SPF of 15 screens 93% of the sun's rays and an SPF of 30 screens 97%. "But the number becomes irrelevant if you aren't applying enough in the first place," says Mona Gohara, MD, a dermatologist in Danbury, Conn., and an assistant clinical professor at Yale University dermatology department. Most people don't use enough, studies show.

"For better protection apply 1 to 2 ounces (the size of a Ping-Pong ball) of sunscreen on your body 30 minutes before going outdoors [so your skin can absorb it completely] and every two hours to any exposed skin after that," Gohara says.

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