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Importance of a good sunscreen cannot be exaggerated. Exposure to UV rays causes premature ageing, sunburn and tanning, pigmentation (which is a common concern among Indian women) and skin cancer.
Sunscreen and sunblock are designed to protect your skin against UVA and UVB rays from the sun, preventing them from reaching the deeper layers of the skin, or by reflecting the radiation.
In fact, advanced sunscreen formulations available today can filter even artificial light and blue light from screen devices.
You should reapply your sunscreen every two to four hours. Experts recommend using sunscreen at least twice a day when you are indoors.
SPF is a measure of how well a sunscreen will protect the skin from UVB (burning) rays. Because of under application of sunscreen in quantity, most dermatologists suggest a minimum of SPF 30.