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SPF, or Sun Protection Factor, measures how well a sunscreen protects the skin from UVB rays—the kind responsible for sunburn and contributing to skin cancer. It’s a common belief that the higher the SPF, the better the protection. But that’s only partly true. SPF 30 blocks about 97% of UVB rays, SPF 50 blocks 98%, and SPF 100 blocks 99%. The increase in protection is marginal beyond SPF 30, and no sunscreen blocks 100% of UV rays. Higher SPF can sometimes give a false sense of security, leading people to skip reapplying or stay longer in the sun. What matters more is using broad-spectrum sunscreen, applying enough (about a shot glass full), and reapplying every 2 hours, especially after sweating or swimming. &lt;br&gt;Dr. Tanvi Vaidya, a Dermatologist from Naupada Thane, speaks about SPF

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