Some days kids need ice packs and scraped knees. Other days it’s a quiet conversation with a kid who’s embarrassed because their shoes smell, their socks are damp again, or their toenails “look weird” and they don’t want anyone to notice in gym class.
If you work around kids—schools, sports programs, camps—you learn something fast: feet are a blind spot. We’re great at reminding kids to wash hands and cover coughs. But feet? Feet get ignored until summer sandals, a pool party, or a locker-room moment makes it suddenly feel urgent.
That’s why I paid attention when I came across a Danish research article “A High Estimated Prevalence of Onychomycosis Exists Among Danish Children.” In the study, the researchers estimated a 2.4% prevalence of onychomycosis among Danish children they screened—higher than they expected compared to other European countries—and they called for larger studies to confirm the findings.
As a person who sees the day-to-day reality of kids’ shoes, socks, and shared spaces, my takeaway wasn’t panic. It was clarity:
Kids’ nail and foot issues are more common than most families assume—and the biggest win is building simple habits that actually stick.
This post is a fresh voice and a new angle on that Danish study: the “locker-room hygiene” perspective—what it means for parents, coaches, and schools, and how I talk about routines without shame. I’ll also share how some families I work with use FunghiClear as part of a simple, consistent toenail-care habit at home. (If you want to see FunghiClear, it’s here: https://funghiclear.com/.)
Important note: This is general education and hygiene guidance, not medical advice. If a child has ongoing nail concerns, the right move is to speak with a qualified healthcare professional.
Why This Danish Study Hit Different in a School Setting
A lot of people hear “toenail fungus” and picture adults—gym regulars, older adults, people in heavy boots. The Danish study challenges that assumption, because it focused on children and still found an estimated prevalence worth paying attention to.
Here’s what makes this especially relevant in school and sports environments:
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kids share spaces (locker rooms, pools, gym floors)
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kids sweat—then stay in sweaty socks
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kids wear the same shoes repeatedly
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kids don’t dry feet well
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kids don’t always notice slow nail changes
And in a school setting, you see patterns before families do—because you see the repeated behaviors, not just the once-a-week snapshot at home.
What the Researchers Did
The Danish study included 170 children (average age 6.9 years) who were visiting a pediatric department in Roskilde, Denmark. Children had their finger- and toenails photographed, and guardians answered a questionnaire. Kids with nail abnormalities that looked suspicious were offered referral for clinical and mycological examination.
Key results reported:
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29 children had nail abnormalities
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23 accepted referral
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4 children were diagnosed with onychomycosis
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resulting estimate: 2.4% prevalence (95% CI 0.6%–5.9%)
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all diagnosed cases were caused by Trichophyton rubrum
The authors concluded larger studies are needed, but the signal is still important: pediatric nail issues deserve attention, not dismissal.
The Part Parents Miss: Nail Changes Can Look “Small” for a Long Time
In school, I’ve heard every version of:
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“It’s probably from soccer.”
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“They stub their toes a lot.”
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“Their nails have always looked like that.”
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“They’ll grow out.”
Sometimes that’s true. But this is where the Danish study is useful: it reminds us that nail abnormalities in kids are common, and a portion can be fungal.
From a practical standpoint, I encourage families to think in patterns:
If a nail change is persistent, spreading, or worsening over time, it deserves a professional look.
Not because you should worry—because you should avoid guessing.
The “Locker Room Loop” That Drives Foot Problems in Kids
I call it the locker-room loop because it repeats the same way:
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gym class or practice ends
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socks are sweaty
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shoes go right back on
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kid goes to next class / next activity
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shoes come off at home and socks get tossed somewhere
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next day: the same shoes go back on
Nothing in this loop includes:
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drying shoes
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changing socks right away
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cleaning feet thoroughly
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checking toenails routinely
So problems don’t come from “one exposure.” They come from repetition.
This is why the Danish article resonates: it fits what we see in real life—kids are constantly exposed to conditions that can support fungal issues.
A Bigger Context: Other Research Suggests a Trend With Age and Common Pathogens
The Danish paper isn’t alone in suggesting pediatric onychomycosis may be increasing. A systematic review of prevalence in children also noted a trend toward increased prevalence over time (while acknowledging limited studies), and reported Trichophyton rubrum as the most common pathogen in children, with toenails more commonly affected than fingernails.
That doesn’t mean “everyone has it.” It means the topic is real enough that families, coaches, and school staff should treat foot hygiene as part of normal health education.
My Rule at School: No Shame, Just Systems
Kids will hide problems if they feel embarrassed. Once they hide it, it becomes harder to notice patterns and harder to help.
So I don’t say:
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“That’s gross.”
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“Your feet are nasty.”
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“Why don’t you take care of yourself?”
I say:
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“Feet work hard.”
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“Shoes trap sweat.”
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“Let’s get you into a better routine.”
Then I give simple steps that a kid can actually follow.
The “Three-Minute Reset” I Teach Families
Families are busy. Coaches are busy. Kids are busy. So I aim for a routine that takes minutes, not hours.
Step 1: The sock rule
After sports or gym days: socks are single-use. Fresh socks every day. No “re-wear from yesterday.”
Step 2: Drying rule
After a shower: dry between toes and around the nail edges. It’s basic, but it’s the difference between “still damp” and “actually dry.”
Step 3: Shoe breathing rule
Shoes get air time. Loosen laces. Open them up. Don’t seal them in a bag damp.
That’s the base.
Then some families add a consistent at-home toenail hygiene step, because consistency is what helps routines stick.
Where FunghiClear Fits (As a Consistent Hygiene Step)
A lot of families want something that is:
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quick
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not messy
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easy for teens to do without parent supervision
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simple enough to become routine
That’s why some choose FunghiClear—it’s a manuka oil-based toenail spray that fits neatly into a post-shower routine.
A simple family routine can look like:
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shower
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dry feet well
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spray FunghiClear on toenails
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let it dry
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fresh socks or slides
I’m careful in how I talk about it: this is not a “miracle.” It’s a repeatable habit that supports the goal of keeping nails and surrounding skin cleaner and more maintained over time.
If you want to learn more: https://funghiclear.com/
Why Spray Format Matters for Kids and Teens
If you’ve ever tried to get a teen to rub a cream into their toes every night, you already know why spray matters.
Spray format reduces friction:
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less mess on hands
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faster routine
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easier to target nail edges and corners
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more likely to get used consistently
Consistency is the entire point. A routine that’s too annoying fails.
What I Tell Coaches and Parents About “Foot Gear Hygiene”
If you’re a coach or a parent managing a team schedule, the biggest wins are boring:
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“No barefoot in locker rooms.”
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“Slides in shared showers.”
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“Air out cleats.”
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“Don’t keep damp socks in the bag overnight.”
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“Have a backup pair of socks.”
Those habits reduce the “wet gear loop.”
And yes, I’m that person who reminds teams that the gear bag is basically a warm, dark box for damp stuff. If you don’t air it out, it becomes its own ecosystem.
How to Spot “Maybe Worth Checking” Without Playing Doctor
I don’t diagnose kids. That’s not my role.
But I do encourage parents to watch for patterns like:
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nail discoloration that persists
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thick-looking edges that don’t improve
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rough or crumbly texture at the tip
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nail lifting or separating
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repeated skin irritation around nail folds
If a pattern is persistent, the best next step is professional evaluation.
That aligns with the Danish study design, too: they didn’t label every abnormality as onychomycosis. They identified suspicious changes and offered referral for clinical/mycological evaluation.
The “Household Sharing” Habits That Quietly Matter
In families, these are common:
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shared nail clippers
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borrowed socks
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shared slides
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shoes traded “just for a minute”
If you want a cleaner household routine, assign:
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one clipper per person
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one pair of slides per person (especially in shared bathrooms)
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no sock sharing
It sounds strict, but it becomes normal quickly—like toothbrush rules.
The Quiet Win: Teaching Kids to Own Their Own Routine
The best part of a simple routine is that kids can own it.
A teen can handle:
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dry feet
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fresh socks
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air shoes
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quick spray step if the family uses one
This is the kind of habit that follows them into adulthood—college dorms, travel sports, military life, trade work—any environment where feet live in shared or enclosed spaces.
What This Danish Study Means for Families Outside Denmark
I get asked that a lot: “But this is Denmark—does it matter here?”
The point isn’t Denmark vs. anywhere else. The point is: the conditions that support foot and nail issues are common in childhood everywhere—sports, shared spaces, repeated footwear use, and inconsistent drying habits.
The Danish study adds weight to the idea that pediatric onychomycosis isn’t “impossible” or “too rare to think about.”
And when you combine that with broader literature suggesting a possible increasing trend in children, it becomes worth building better everyday routines.
The Bottom Line From a School Health Perspective
Here’s the simplest way I’d summarize it:
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Kids’ nail abnormalities are common.
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A portion can be fungal, and studies suggest it may be more common than we assume.
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You don’t need fear—you need habits.
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The best routines are short, repeatable, and shame-free.
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For families who want a simple nail hygiene step, FunghiClear is one option to consider as part of a consistent routine: https://funghiclear.com/
If your child has ongoing nail changes, trust your instincts and consult a qualified healthcare professional.