How Does Sunscreen Work

How Does Sunscreen Work
Sunscreen works by blocking out the ultraviolet light that causes damage to your skin. The less damage done to your skin from the sun the less likely you will be to get wrinkles or cancer caused by the sun damaged cells. Sun protection factor is the industry standard for packaging store bought sun protection. The SPF rating is calculated by determining how long it would take for protected skin to burn compared to unprotected skin. All store bought sun screens have a varied shelf life but most can last between 2-3 years if properly stored.