Sunscreen Smarts: Dermatologists Reveal Essential Tips for Optimal Sun Protection

Daily Health

18/06/2026

As summer approaches, understanding how to effectively use sunscreen is crucial for protecting your skin from harmful UV rays. Many people make common mistakes that reduce the efficacy of their sun protection. Dermatologists offer expert advice to ensure you're applying, choosing, and reapplying sunscreen correctly to prevent sunburn and long-term skin damage.

Key Takeaways

SPF Matters: Choose an SPF of 30 or higher for adequate protection.
Broad Spectrum is Best: Ensure your sunscreen protects against both UVA and UVB rays.
Generous Application: Apply sunscreen liberally to all exposed skin.
Frequent Reapplication: Reapply every two hours, or more often if sweating or swimming.
Don't Forget Key Areas: Lips, ears, and the tops of feet need protection too.

Choosing the Right Sunscreen

Dermatologists emphasize the importance of selecting a broad-spectrum sunscreen with an SPF of 30 or higher.

Protection and formula essentials

Feature	What to look for	Why it matters
SPF	30 or higher	Provides adequate everyday protection; gains above SPF 50 are smaller.
Spectrum	Broad spectrum	Protects against both UVA aging rays and UVB burning rays.
Water resistance	Water-resistant formula for swimming or sweating	Helps protection last better during water exposure, but still requires reapplication.

Application Techniques

1 ounce

That is the approximate amount needed to cover all exposed skin on the body—about a full shot glass.

A common mistake is not using enough sunscreen. Experts advise applying about one ounce, enough to fill a shot glass, to cover all exposed areas of the body. This includes often-missed spots like the tops of your ears, the back of your neck, and the tops of your feet. For the face, a nickel-sized amount is generally sufficient.

Reapplication Schedule

Sunscreen needs to be reapplied regularly to maintain its effectiveness. The general rule of thumb is to reapply every two hours. However, if you are swimming, sweating heavily, or toweling off, you should reapply immediately after. Even water-resistant sunscreens lose their potency over time with exposure to water and friction.

Beyond Sunscreen

While sunscreen is a vital tool, it's not the only line of defense against sun damage.

Other ways to reduce sun exposure

Seek shade

Peak hours·10 a.m. to 4 p.m.

Limit direct exposure when the sun is strongest, especially in the middle of the day.

Protective clothing

Long sleeves·Wide-brimmed hats

Use clothing barriers to reduce how much UV radiation reaches your skin.

UV-blocking sunglasses

Eye protection·Delicate surrounding skin

Sunglasses help shield both your eyes and the sensitive skin around them from sun damage.

Dermatologists also recommend seeking shade, especially during peak sun hours (typically 10 a.m. to 4 p.m.), wearing protective clothing such as long sleeves and wide-brimmed hats, and wearing UV-blocking sunglasses to protect your eyes and the delicate skin around them.