Of course the basic act of applying sunscreen daily is crucial to skin cancer prevention — but the amount, frequency and SPF level used is equally as important. Apply sunscreen every morning, using a broad-spectrum product with an SPF 15 or higher.
Switch to a water-resistant, SPF 30 or higher when you’re planning to spend extended time outdoors. Apply at least one ounce of sunscreen to your exposed skin 30 minutes before going outside. And then be sure to reapply every two hours or immediately after swimming or sweating.