Using a face mask effectively comes down to three things: choosing the right type, getting a good seal against your face, and knowing when to replace it. Most people wear masks loosely or touch them too often, which significantly reduces protection. Here’s how to get the most out of whichever mask you use.
Choosing the Right Mask
Not all masks offer the same level of protection, and the differences are significant. A properly fitted N95 or KN95 respirator filters at least 95% of airborne particles and lowers infection odds by about 83%. Surgical masks filter roughly 47% to 50% of particles and reduce infection odds by 66%. A simple cotton mask filters only 17% to 20% of particles, lowering infection odds by 56%.
If you’re in a high-risk setting, like a crowded indoor space or a hospital waiting room, an N95 or KN95 is your best option. Even a loose-fitting N95 filters 57% to 86% of particles, which still outperforms a surgical mask. For lower-risk everyday situations, a well-fitting surgical mask provides reasonable protection. Cloth masks are the least effective option but still better than nothing, especially when layered properly.
How to Put a Mask On
Start with clean hands. Wash them or use hand sanitizer before touching the mask. Hold the mask by the ear loops or ties, and place it over your nose and mouth. If the mask has a flexible metal strip along the top edge, press it firmly around the bridge of your nose so it conforms to your face shape. The mask should fit snugly against your cheeks and sit below your chin with no large gaps on the sides.
For ties instead of ear loops, secure the top ties at the middle of your head and the bottom ties at the back of your neck. Once the mask is on, avoid touching the front surface. If you do touch it, clean your hands immediately. Keep adjustments to a minimum.
Checking the Seal on an N95
An N95 only works at full capacity if it seals against your face. After putting one on, do a quick seal check. Cup both hands over the front of the respirator and exhale gently. You should feel slight pressure building inside the mask. If air leaks out around the edges, if your glasses fog up, or if you feel air moving along your cheeks or nose, the seal isn’t right.
If your respirator has an exhalation valve, do the reverse: cover the filter surface with your hands and inhale sharply. The mask should collapse slightly against your face. If it doesn’t, air is leaking in around the edges. To fix a leak around the nose, place your fingertips at the top of the metal nose clip and slide them down both sides, molding it more tightly to the shape of your nose. Readjust the head straps until no air escapes.
Improving Fit on a Surgical Mask
Surgical masks are designed to be loose, but you can dramatically improve their fit with a simple technique called the knot-and-tuck method. Take the ear loops and tie a knot in each one right where it attaches to the edge of the mask. Then tuck the extra material that bunches up at the sides flat against your face. This eliminates the large gaps that normally form along your cheeks, turning a baggy surgical mask into something that fits much more closely.
Another option is double masking. Wearing a surgical mask underneath a cloth mask improves filtration efficiency to roughly 66% to 81%, a significant jump over either mask worn alone. The surgical mask provides the filtration layer while the cloth mask on top presses everything tighter against your face.
When to Replace Your Mask
Replace or wash your mask whenever it becomes visibly dirty, damp from breathing, torn, or difficult to breathe through. Stretched-out elastic bands and fraying fabric are signs a mask has reached the end of its useful life. A wet mask is less effective at filtering and can harbor bacteria against your skin.
Surgical masks are labeled for single use, but research shows most disposable masks retain a high level of their original filtration efficiency even after 40 hours of cumulative wear. That said, filtration is only part of the equation. A mask that’s been worn all day collects moisture and contaminants on the surface, so practical limits matter more than the lab data might suggest. For most people, replacing a disposable mask after a full day of wear is a reasonable approach.
How to Remove a Mask Safely
The front of your mask is the most contaminated part. Never grab it by the front panel. Instead, reach behind your head or ears and grasp only the ear loops, ties, or elastic bands. Pull the mask away from your face and either discard it in a waste bin (for disposables) or place it directly into the laundry (for cloth masks). Wash your hands immediately after removal.
Washing Cloth Masks
Cloth masks should be washed after each use. Machine washing with regular laundry detergent in hot water is sufficient. Use a fragrance-free, hypoallergenic detergent if your skin is sensitive. You can machine dry them as well, as long as the mask holds its shape. If you’re hand washing, use hot water and the same type of detergent, then let the mask air dry completely before wearing it again. Never rewear a cloth mask that’s still damp.
Preventing Skin Irritation
Prolonged mask use can cause breakouts, chafing, and irritation, sometimes called “maskne.” A few simple habits make a big difference. Before putting your mask on, wash your face with a mild, fragrance-free cleanser and apply a fragrance-free moisturizer that won’t clog pores. Look for ingredients like ceramides, hyaluronic acid, or dimethicone, which protect and hydrate the skin barrier. Choose a gel moisturizer if your skin is oily, a lotion for normal skin, or a cream for dry skin.
Apply petroleum jelly to your lips before masking up to prevent chapping, but keep it off the surrounding skin to avoid clogging pores. Skip makeup under your mask whenever possible, since it’s more likely to cause breakouts in that warm, humid environment. If you must wear makeup, use products labeled non-comedogenic.
Avoid introducing harsh new skincare products while you’re wearing masks regularly. Chemical peels, exfoliants, retinoids, and leave-on salicylic acid treatments can make irritated skin worse. If your skin is already inflamed, scale back to the basics: gentle cleanser, simple moisturizer, and nothing else.
For cloth masks, choose one with a soft cotton inner layer against your skin. Synthetic fabrics like nylon, polyester, and rayon tend to cause more friction and irritation. Taking a 15-minute mask break every four hours, when you can do so safely, also helps your skin recover.