Sunscreen is your best defense against sun-damaged skin.br But there are plenty of misconceptions about the most effective way to use sunscreen.br Here are six common myths about sunscreen.br 1. MYTH: You’re using enough sunscreen. Most people only apply 25 to 50 percent of the recommended amount of sunscreen.br 2. MYTH: Sunscreen can be waterproof or sweat-proof. Although it may not wash off as easily, sunscreen can only be classified as water-resistant.br 3. MYTH: Makeup with sunscreen is enough. The SPF in cosmetics may not be more than 30 or isbr broad-spectrum, meaning it's not enough protection.br 4. MYTH: Sunblock and sunscreen are the same thing. Sunblock reflects the sun’s UV raysbr while sunscreen chemically filters them.br 5. MYTH: Sunscreen doesn’t ever expire. Sunscreen bottles have a visible expiration datebr that should be followed for maximum effectiveness.br 6. MYTH: You should only wear sunscreen in the summer. UVA and UVB rays are present whenever the sun is out, even in the winter.