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How long does sunscreen last? How does SPF work?




The sun-soak season is here, and that means that if you do not saponify with sunscreen, you could severely damage the DNA of your skin cells and make you develop a potentially deadly form of cancer.

Melanoma kills more than 10,000 Americans each year, according to the Skin Cancer Foundation.

These deadly cancers are typically caused by ultraviolet rays, either when baking in the sun or lounging in a sunbed.

Treat yourself both often enough, and you can begin to develop cancerous moles. If these signs are not detected in time, the melanoma can spread to other areas of your body, and become difficult to control, even deadly cancer.

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So it's important to apply some sunscreen if you want to spend time in the sun ̵

1; especially in the warm summer months when the UV index rises and the sun gets stronger.

We've got the help of two skin experts to explain how long the sunscreen lasts and how to properly apply it again. Here is her best advice:


Marianna Massey / Getty Images

The sun protection factor for sunscreen is only 100% guaranteed for two hours after you put it on.

"When we talk about re-applying sunscreen every two hours, that number comes out of the test of SPF," says John Zampella, dermatologist at NYU Langone Health, said. He explained that SPF numbers are based on how much protection a particular sunscreen gives against the sun for two hours.

When you're active and enjoying the sun, like on the beach or in a ball game, it's important to play again afterwards.

If you create an SPF of 50 at around 10:00 am around noon, "you're probably still getting protection, but your SPF 50 is not correct anymore," Zampella said. "Maybe you will get SPF 10 at this time."

At least SPF 30 should be used for full protection.

That suggests the American Academy of Dermatologists.

SPF 30 is also the dose that skin expert David Leffell, author of "Total Skin: The Ultimate Guide to All Skin Care for Life" and Head of Dermatological Surgery at the Yale School of Medicine, has in store for himself. For most people, this protection factor provides enough protection to fend off about 96% of the harmful, burning UVB rays outside, whether on the beach or on the golf course.

Sensitive and fairer skin tones may opt for SPF 50 to get a little extra protection, but Leffell says that any SPF higher than 50 provides only minimal added benefit.

It is particularly important to regenerate sunscreen in certain areas of the body and face that are prone to burns and skin cancer.

These include the top of the ears, forehead, cheeks, and nose.

Wear sunscreen with you during the day.

Zampella says he carries a bottle of sunscreen every day.

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"Do I use it every two hours? Probably not," he said. Realistically, he probably applies twice a day in the city. But he is more alert when he's out all day. "At the beach I try it every two hours."

Make it a daily habit.

According to Leffell, every morning you should cover your morning routine with sunscreen, "as you brush your teeth."

"If you make it a normal behavior, you have a much greater chance that you will not see it as trouble and that you will not forget it," he said.

Zampella agrees. He says that sun care is a daily reflex that "gives you the best long-term benefits of both skin cancer screening and anti-aging protection."

Women should pay special attention to their breasts while men should take care of their heads.

Leffell says women should pay particular attention to protecting the "v" of their breasts from burns, as the damage there is "very difficult to cosmetically reverse with lasers."

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For men, he recommends that anyone who has lost a little hair should generously apply sunscreen to their bald spots and neck and probably add a hat.

"We see a lot of skin cancer on the scalp," he said.

Once soaped, go out and enjoy a little sun!

There are many scientific studies that suggest that a little bit of sunshine can be good for your bones, mood, and waist regularly.


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