Detailed answer

Sunscreen can expire due to various factors such as exposure to heat, sunlight, and the passage of time. The expiration date of sunscreen is usually stated on the packaging, and it is important to follow these guidelines for optimal protection. Expired sunscreen may become less effective in blocking sun rays and may not provide the adequate sun protection factor (SPF) as stated on the label. It is generally recommended to replace sunscreen that is past its expiration date to ensure proper sun protection. Additionally, it is crucial to store sunscreen properly in a cool and dry place to help prolong its shelf life.