Kem chống nắng là mỹ phẩm dùng để phản chiếu hoặc hấp thụ những tia cực tím (UV) độc hại, từ đó giúp cho làn da không bị đen và cháy nắng. Tuy nhiên, không phải ai cũng biết cách bôi sao cho đúng và tần suất bôi bao nhiêu 1 ngày là đủ. Cùng theo dõi bài viết dưới đây nhé! 1 Kem chống nắng có tác dụng bao lâu? Nhiều chị em lầm tưởng, kem chống nắng có tác dụng 24h - 48h nhưng thực tế, kem chống nắng tác dụng được bao lâu phụ thuộc chỉ số SPF, cụ thể: 1 SPF = 10 phút bảo vệ da, hạn chế tác hại của tia UVB trong khoảng 10 phút. Điều này cũng đồng nghĩa kem chống nắng có chỉ số SPF càng cao thì khả năng chống nắng càng mạnh, thời gian tác dụng của kem chống nắng trên da càng lâu dài. - Kem chống nắng SPF 30 có tác dụng bảo vệ da trong khoảng 300 phút, tương đương 5 giờ, ngăn chặn 97% tia UVB. - Kem chống nắng SPF 45 có tác dụng bảo vệ da trong khoảng 450 phút, tương đương 7,5 giờ, ngăn chặn 97,5% tia UVB - Kem chống nắng SPF 50 có tác dụng bảo vệ da trong khoảng 500 phút, tương đương 8,3 giờ, ngăn chặn 98% tia UVB 2. Tần suất bôi kem chống nắng một ngày. Trên thực tế, không phải kem chống nắng có chỉ số SPF càng cao càng tốt và cho rằng như vậy là đã yên tâm về khả năng bảo vệ da. Theo thông số trên, kem chống nắng SPF 50 chỉ giúp bạn bảo vệ da nhiều hơn 1% so với kem chống nắng SPF30. Bởi kem chống nắng sẽ giảm dần và bị phân hủy do tác động trực tiếp với ánh sáng, khi cọ xát với quần áo, mồ hôi từ cơ thể làm trôi kem. Vì vậy, tùy thuộc loại kem chống nắng mà bạn sử dụng, nếu chỉ số chống nắng thấp cần thoa lại sau mỗi 2 giờ, nếu chỉ số chống nắng cao hơn có thể thoa lại sau 3 - 4 giờ. Khi hoạt động ngoài trời, bơi lội thì sau 2 giờ bạn vẫn nên thoa lại 1 lần. 3 Thoa kem chống nắng bao nhiêu là đủ? Bạn nên thoa 1 lượng vừa đủ để bao phủ toàn bộ bề mặt da. Thoa quá ít sẽ không đủ hiệu quả chống nắng, ngược lại thoa quá nhiều sẽ làn da bí bách, bít tắc lỗ chân lông dễ dẫn đến hình mụn, kích ứng và những vấn đề về da khác. Đối với kem chống nắng dạng xịt sẽ cần khoảng 4 lớp kem để yên tâm da đã dùng đủ liều lượng. Trên đây là các thông tin “Kem chống nắng có tác dụng trong bao lâu?”. Hi vọng rằng với những chia sẻ trên sẽ giúp bạn biết được da mình phù hợp với loại kem chống nắng nào để bảo vệ làn da tốt nhất. 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