How long can use your sunscreen after opening the bottle?

Usually sunscreens work for about 2-3 years, though you need to check the expiration date on a sunscreen bottle.

However, many experts note that if you use sunscreen correctly, applying sunscreen generously on exposed body parts and reapplying it every two hours, there is a little chance that you will have any leftovers next year.

Also note that heat and incorrect storage can make your sunscreen break down faster.