The sunscreen is used to protect the skin from damage caused by ultraviolet rays. It avoids sunburn, prevents premature aging, and above all reduces the risk of skin cancer. The creams are not all the same and it is important to choose the right protection factor. But it does not end here, we must apply it correctly and avoid some unfortunately very common mistakes.
Let’s see what are the rules for choosing and using sunscreen.
How to choose the right sunscreen
Creams are characterized by the protection factor, called SPF.
The SPF provides protection from UVB rays and the number indicates how many it filters and how many it allows to pass. For example, protection 6 allows one sixth of the UVB rays to pass. Protection 50 only allows one fiftieth to pass. A little cumbersome.
Experts recommend using products with SPF 30 and up. High protections (30 and 50) block 97% and 98% of UVB respectively if applied correctly.
UVA protection can be explicitly indicated on the packaging or represented by a symbol, a circle that encloses the UVA writing. In this case, European legislation states that UVA protection is equal to one third of the SPF. Short sad story: there is no full screen.
The cream must be bought back every year
Unfortunately, that’s the way it is. Even if cosmetics don’t have an expiration date, they have a PAO, which indicates how many months they can last once opened.
This indication should not be underestimated, especially when it comes to solar products, whose filters are in fact subject to decay. So using the cream opened more than a year ago does not guarantee protection and puts us at risk.
When and how to apply sunscreen
The cream should be applied twenty minutes before sun exposure and reapplied every two hours.
It must also be reapplied after the baths and the use of the towel.
The distribution must be uniform over the whole body.
The recommended dose approved by the tests is two milligrams per square centimeter of skin. Approximating, it means that an adult should apply 30 to 40 grams of cream each time.