Why is it essential to use sunscreen even after tanning?

Using sunscreen after tanning is essential primarily because it protects the skin from harmful UV radiation. Even if someone has already tanned, their skin remains vulnerable to the damaging effects of UV rays. These rays can lead to sunburn, premature aging, and an increased risk of skin cancer. Sunscreen creates a protective barrier that helps shield the skin from both UVA and UVB rays, minimizing the potential for damage that can occur from further sun exposure.

While the other options may have their merits—such as moisturizing benefits or potential enhancements to skin color—they do not directly address the critical need for skin protection from UV radiation. The primary purpose of sunscreen is to safeguard health and prevent harm, making it an indispensable part of any tanning routine.