The single most important rule for preventing ingrown toenails is to cut them straight across and leave them long enough that the corners sit on top of the skin, not buried beneath it. Most ingrown nails start because the nail was trimmed too short, rounded at the edges, or cut into a V-shape, all of which allow the nail edge to dig into the surrounding skin as it grows back.
Why Ingrown Nails Happen
An ingrown toenail develops when the edge of the nail plate grows into the soft skin fold alongside it. This causes pain, swelling, and sometimes infection. The big toe is the most common site, though any toenail can be affected.
The skin around your toenails naturally presses against the nail edge. When that edge is sharp, jagged, or cut below the skin line, it acts like a tiny blade pushing into the tissue with every step you take. Athletic activity, excess body weight, and tight shoes all increase the ground-reaction forces that drive the nail deeper into the skin fold. Some people also have naturally wider skin folds around their nails, which makes them more prone to the problem regardless of how carefully they trim.
The Right Way to Cut
Follow this sequence every time you trim your toenails:
- Soften first. Soak your feet in warm water for 5 to 10 minutes. Softened nails are easier to cut cleanly and less likely to crack or splinter, which leaves behind the jagged edges that dig into skin.
- Cut straight across. Make one or two clean passes across the nail in a straight line. Do not curve the cut to follow the shape of your toe, and do not taper the corners into a rounded or pointed shape.
- Leave enough length. The corners of the nail should rest loosely against the skin at the sides of your toe. If you can see skin peeking above the nail edge at the corners, you’ve cut too short.
- Smooth the edges. Use a coarse nail file or emery board to gently take down any roughness or sharp points left by the clippers. File in one direction rather than sawing back and forth, which can fray the nail.
A good visual test: after trimming, press lightly on the skin next to each corner of the nail. If the corner is visible and not tucked under the skin fold, you’re in the right range.
Choosing the Right Tool
Standard toenail clippers have a wide jaw with a straight cutting edge, which naturally produces the flat, straight cut you want. They’re the best default tool for most people. If your nails are especially thick, toenail nippers (sometimes called podiatry nippers) offer more leverage and sharper blades for a cleaner cut through tough nail.
Avoid using cuticle nippers or small fingernail clippers on your toenails. Cuticle nippers aren’t built for the thickness of toenails and tend to produce uneven, jagged cuts, exactly the kind that lead to ingrown edges. Fingernail clippers are too small to span the full width of most toenails, which tempts you into making multiple angled cuts and rounding the corners.
Whatever tool you use, make sure the blades are sharp. Dull clippers crush and tear the nail rather than slicing it, leaving rough edges that catch on skin.
How Often to Trim
Toenails grow roughly 1.5 millimeters per month, much slower than fingernails. For most people, trimming every 6 to 8 weeks keeps them at a comfortable length without letting them get long enough to catch on socks or press against the front of your shoe. If you’re physically active or wear closed-toe shoes daily, check them every few weeks and trim when any nail starts touching the inside of your shoe.
Shoes Matter More Than You Think
Even a perfectly trimmed nail can become ingrown if your shoes squeeze your toes together. Tight or narrow toe boxes push the skin fold against the nail edge with every step, mimicking the same pressure that a bad trim creates. Shoes that fit correctly should leave enough room to wiggle your toes freely. If you can feel the front of the shoe pressing on your big toenail, the shoe is too short or too narrow.
Roomy shoes or sandals are the simplest footwear change you can make. This is especially relevant for runners and athletes, whose feet swell during activity and absorb repeated impact forces that push the nail into surrounding tissue.
Common Mistakes That Cause Ingrown Nails
Most ingrown toenails trace back to one of a few habits:
- Rounding the corners. It feels intuitive to shape the nail to match the curve of your toe, but this removes the corner that should be resting on top of the skin. As the nail grows out, the new edge has nothing to guide it and pushes directly into the skin fold.
- Cutting too short. Trimming the nail below the tip of the toe exposes the soft tissue underneath and gives the regrowing edge a direct path into the skin.
- Tearing or picking. Ripping off a hangnail or picking at a loose edge almost always leaves a small spike of nail behind. That spike is invisible but sharp enough to puncture the skin fold within days.
- Cutting a V-notch. An old myth suggests cutting a V into the center of the nail to “relieve pressure.” This does nothing to change how the edges grow and only weakens the nail.
What an Ingrown Nail Looks Like Early On
The first sign is usually tenderness along one side of the nail, especially when you press on it or wear shoes. The skin next to the nail may look red or slightly swollen. At this stage, soaking the foot in warm water, wearing open-toed shoes, and letting the nail grow out past the skin fold is often enough to resolve it.
If the redness spreads, the area becomes warm to the touch, or you notice pus draining from beside the nail, the tissue is likely infected. At that point, the nail edge may need to be lifted or partially removed by a podiatrist. Trying to dig out the nail yourself with bathroom tools usually worsens the problem and introduces bacteria.
Special Considerations for Diabetes
People with diabetes, particularly those who have lost sensation in their feet (peripheral neuropathy) or have poor circulation, face higher risks from any foot wound, including ingrown nails. Reduced feeling means you might not notice a nail digging into your skin until infection has set in. Thickened, yellowed nails, common in diabetes, are also harder to trim safely at home.
If you have diabetes with neuropathy, vision loss, or noticeably thickened nails, having your toenails trimmed by a podiatrist is a safer option than doing it yourself. Many clinics include nail care as part of routine diabetic foot exams.