Sunscreen can lose its effectiveness over time, and using expired products might result in inadequate protection against harmful UV rays. Most sunscreens are labeled with an expiration date, and it is advisable to respect this date, as the active ingredients can degrade, impacting the product's ability to shield your skin from sunburn and long-term skin damage.

While using expired sunscreen may not pose immediate health risks, the reduced efficacy could lead to sunburn or increased skin damage. Therefore, it’s crucial to check the expiration date before applying sunscreen, especially if you are planning to spend extended periods outdoors. If your sunscreen is expired, it's best to replace it with a new one to ensure optimal sun protection.