DEET Repellent: What It Is and How to Use It Safely

DEET is the active ingredient in most mosquito and tick sprays you see in stores. It has been trusted for decades to keep bugs away, especially in hot weather or when you travel to places with disease‑carrying insects.

If you’ve ever wondered why some sprays say "DEET 10%" while others claim "DEET 30%," you’re not alone. The percentage tells you how strong the protection is, but higher isn’t always better for every situation.

How DEET Works

DEET doesn’t kill insects; it confuses their sense of smell. Mosquitoes rely on scent to find you, and DEET masks the chemicals your skin releases. When the bugs can’t sniff you out, they stay away.

The effect lasts longer with higher concentrations. A 10% solution might protect you for about an hour, while 30% can last up to six hours. Beyond 50%, you don’t gain much extra time, but you do increase the chance of skin irritation.

Choosing the Right DEET Strength

Think about where you’ll be and how long you’ll stay outdoors. For a quick garden walk, 10‑15% is plenty. If you’re camping overnight or hiking in a mosquito‑heavy area, aim for 20‑30%.

Children under two months should avoid DEET altogether. For older kids, stick to 10% or less and apply only to exposed skin, not the hands or face.

Apply the spray to clean, dry skin and let it dry before putting on clothes. Don’t reapply until the protection time runs out, not just because you feel a little sticky.

Store the bottle away from heat and direct sunlight. DEET can break down in hot conditions, making it less effective.

If you prefer a scent‑free experience, many brands now offer “unscented” DEET formulas that still work just as well.

When you’re done, wash off the repellent with soap and water. This helps prevent any lingering skin irritation, especially if you plan to apply sunscreen later.

DEET is safe when used as directed, but mixing it with other repellents or using it on damaged skin can cause problems. Always read the label before you spray.

Finally, remember that no repellent is 100% foolproof. Wearing long sleeves, using netting, and avoiding peak mosquito times (dawn and dusk) add extra layers of protection.

With these simple tips, you can stay comfortable outdoors without endless bites. Choose the right DEET strength, apply it correctly, and enjoy your time outside worry‑free.