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Water resistance measurement is based on a sunscreen's ability to maintain its SPF after being immersed in water.

Sunscreens that are "water-resistant for 4 hours" maintain an SPF of 50 after 4 hours of immersion in water. Generally sunscreens remain effective for 3 years from the date of manufacture.

If sunscreens have expired there is a good chance they are still good for a few months; however once you reach the expiration date there is no guarantee that the level of activity is still present.

You may also want to point out a few of these basic but important tips to your clients next time they inquire about purchasing their sunscreen from you: • The best place to store your SPF product is in a cool place out of direct sunlight and heat. larger “30% extra for free” products, which will inevitably expire before you get a chance to use them all and you’ll end up having to throw them out.

"If spring comes and you still have some left from the prior year, finish it up and then get a new bottle," dermatologist Dr.

Melissa Piliang of the Cleveland Clinic told Business Insider.

We also know that approximately 80-99% of extrinsic aging comes from exposure to UVR!

For this reason, The International Dermal Institute recommends using sunscreen every day, not just during the summer months.

Before I answer this, it’s important to understand that a sunscreen’s expiration date is based on tests that a sunscreen manufacturer has conducted to demonstrate how long the product retains its efficacy and safety.

One of the most critical products that I would advocate a client use before any other type of skin care product would be a sunscreen.

We know that Ultraviolet radiation (UVR) is responsible for a number of skin concerns ranging from various forms of hyperpigmentation to more serious precancerous and cancerous lesions.

If a manufacturer runs a test for only 2 years, then they can only label that a sunscreen’s efficacy is for 2 years.

However, this doesn’t necessarily mean that the sunscreen will automatically ‘go bad’ or lose its efficacy the day after its expiration date.

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