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SPF, or Sun Protection Factor, is a measure of how well a sunscreen can protect the skin from UVB rays. Sunscreens today usually range between SPF 30 - 50 and some may also be SPF 100. Dermatologists recommend using a broad-spectrum sunscreen, applying it generously, and reapplying every few hours, to ensure optimal protection. <br> <br>Prof. Dr. Bela Shah, dermatologist from Ahmedabad, Gujarat, discusses SPF in sunscreens.