1. It is still possible to get tanned after applying sunscreen, especially if the SPF value of the sunscreen is not high enough or not applied correctly.
2. Long term exposure to strong sunlight, even with sunscreen, may cause damage to the skin from ultraviolet rays, leading to tanning.
3. Sunscreen needs to be reapplied regularly, especially after swimming or sweating, otherwise its protective effect will weaken and increase the risk of tanning.