Toenail fungus, and what a laser can honestly do about it.

A fungus living in the keratin of the nail plate and the nail bed underneath it. Most often a dermatophyte — the same family of organisms behind athlete’s foot, which is usually where it came from. Sometimes a yeast, occasionally a mould.

It shows up as yellow or brown discolouration starting at the free edge, thickening, crumbling debris under the nail, and eventual separation of the plate from the bed. It is generally painless until the nail gets thick enough to press against a shoe, and then it is not.

Two things follow from where the fungus lives, and they govern everything else on this page. First, the nail plate is dense, dead keratin, which is a poor target for drugs and an awkward one for light. Second, an infected nail does not heal — it grows out. A toenail replaces itself over roughly nine to eighteen months, so nothing you do here will look like anything for a season. Anyone showing you a dramatic three-week comparison photograph is showing you a nail that was filed, not a nail that was treated.

This is not a formality, and it is the single most useful thing on this page. Fungal infection accounts for roughly half of all nail disease, which means roughly half of the discoloured, thickened, crumbling toenails that walk through a door are something else entirely.

The commonest impostor is ordinary repetitive trauma — a shoe that is a half size short, or a running habit — which thickens and discolours a nail in a way that looks identical from three feet away. Nail psoriasis is next, and lichen planus after that. Rarely, and this is the one that matters, a pigmented streak or a dystrophic nail is a subungual melanoma, and treating it as a fungus wastes the only thing that helps, which is time.

So we confirm before we treat. That means a look under the dermatoscope, and a laboratory test on nail clippings and subungual debris — KOH microscopy, PAS histopathology of the clipping, fungal culture, or a combination, depending on what the examination suggests. This is standard of care for a reason: current guidance is that confirmatory testing be done for every patient before any antifungal treatment is started, and the same logic applies before any device is pointed at the nail.

The laboratory bills you directly at its own price, the way any lab we order does. We do not mark it up.

If the test comes back negative, you have not bought a treatment. You have bought the correct answer, which is usually cheaper. Trauma gets a shoe conversation and a trimming plan. Psoriasis or lichen planus gets a referral to dermatology. Anything pigmented or asymmetric that concerns us on examination gets a referral the same week, and we will say so out loud rather than book you a package.

This section is the reason this page exists, so we will be exact.

Several 1064 nm Nd:YAG laser systems hold FDA 510(k) clearance for a specific and deliberately modest indication: the temporary increase of clear nail in patients with onychomycosis. Read that wording twice. It is a clearance for a temporary cosmetic change in the appearance of the nail. It is not a clearance to eradicate a fungal infection, and the FDA has never granted one.

Our 1064 nm Nd:YAG is one of the four lasers on the Rohrer Spectrum platform, where we use it for vascular work and, in its Q-switched mode, for pigment and ink. The Spectrum is not cleared for nails, so we treat this use as off-label and tell you so before you pay for anything. Off-label is legal, common, and not by itself a mark against a treatment — the RF microneedling we do for acne scarring is off-label too, and we say that on its page as well. What off-label does mean is that the FDA has not reviewed this device for this use, and that nobody — including us — gets to borrow the word “cleared” to make it sound settled.

Our general position on what that word does and does not buy you is on the equipment page.

Weaker than the marketing, and inconsistent enough that honest summaries disagree with each other. Here is the shape of it.

The 2020 Cochrane review of topical and device-based treatments for toenail fungus found three trials comparing a 1064 nm Nd:YAG laser against no treatment or a sham. Pooling the two that could be pooled — eighty-five people between them — there may be little or no difference in laboratory cure at one year. Complete cure was not measured at all in those trials. Cochrane graded the evidence low quality and concluded that the effectiveness of device-based treatment remains uncertain.

Single-arm pooling looks friendlier and is worth understanding rather than dismissing. A 2019 meta-analysis of twenty-two prospective trials, seven hundred and fifty-five people, reported laboratory cure in about seventy per cent and visible improvement in about two-thirds — but complete cure, meaning a normal-looking nail with the fungus gone, in about seven per cent, with a confidence interval running from two to twenty-four. Heterogeneity across those trials was extreme. That is the honest headline: laser studies are much better at producing a nail that looks improved than a nail that is both clear and clear of fungus.

Controlled comparisons land in the same place. A randomized trial of long-pulsed 1064 nm Nd:YAG against a topical lacquer for non-dermatophyte nail infection put laser alone at thirty-five per cent laboratory cure and ten per cent clinical cure, behind the lacquer on both. Where laser has looked best is as an add-on to a topical or oral antifungal rather than instead of one.

So: the reason to consider this is not that it works better than the alternatives. It is that it is topical in the sense that matters — it does not go through your liver.

Oral terbinafine is the first-line treatment for dermatophyte toenail infection, and it is substantially more effective than any laser protocol published to date. A page that sells you a laser without saying that is not a page you should trust.

The numbers, from the trial the whole field still argues over — twelve weeks of terbinafine 250 mg daily produced laboratory cure in about three-quarters of patients at eighteen months, roughly double the pulse-dosed comparator. Its five-year follow-up found complete cure in about a third and laboratory cure in about half, with mycological relapse in a little under a quarter. Those are not spectacular numbers in absolute terms — this is a stubborn infection — but they are the best numbers in the field, and they are several times what laser monotherapy has shown.

The honest counterweights, since they are the reason anyone looks at a laser at all. Terbinafine is a real drug: it interacts with other medications, it is not appropriate in liver disease, and most clinicians check baseline liver labs and repeat them during a course. It is a daily pill for three months. Some people cannot take it, some people have been told not to take it, and some people simply will not.

Whether the oral route is right for you, and whether it is something we write here or something we route to your primary care clinician or a dermatologist, is a conversation at the consultation once the diagnosis is confirmed — not a decision to make from a web page. What we will not do is let you buy sessions of laser without hearing the comparison first.

There are also FDA-approved prescription topicals for this — efinaconazole, tavaborole, ciclopirox. Their complete cure rates are low and the course runs about a year, but they are approved for the indication, which is more than the laser can say, and they combine well with everything else here.

It reasonably is, for some people: those who cannot take an oral antifungal, those whose clinician has told them not to, those already on a drug that terbinafine interacts with, and those who have taken a full course, relapsed, and want to add something rather than repeat it.

What the visit involves. We debride the nail first — reducing the thickness is not cosmetic here, it is what lets both light and any topical reach the nail bed. Then the 1064 nm Nd:YAG is passed over the nail plate and the surrounding fold in a grid, in several passes, warming the nail. It is a hot, prickling sensation that builds through the pass and drops the moment it stops. Most people describe it as unpleasant rather than painful, and it is over in minutes per nail.

Sessions are typically spaced a few weeks apart and planned as a short series rather than a single visit, with the exact number set at the consultation once we have seen how many nails and how much of each is involved. Nothing is prepaid and nothing is packaged — the same policy as everywhere else on this site, and here it matters more than usual, because the sensible moment to stop may arrive before the sessions run out.

Then you wait. We photograph the nail against a fixed reference at baseline and re-measure at three, six and twelve months, because the only meaningful question is how much clear nail has grown from the fold, and the only way to answer it is a ruler and a calendar. Individual results vary, and we will show you your own photographs rather than somebody else’s.

We treat the feet in this room and we do not extend this treatment beyond nails. If your nails are infected, your skin almost certainly is too, and treating the nail while leaving athlete’s foot alone is how people re-infect themselves. That gets treated at the same time, and so do your shoes.

Onychomycosis comes back. Recurrence after apparently successful treatment is common with every modality including the oral drugs, and it is why we will not use the word cure about your nail no matter what a study endpoint was called.

What reduces the odds is dull and free. Treat the athlete’s foot that fed it. Dry between the toes. Rotate shoes so each pair gets a day to dry out, and disinfect or replace the ones you wore through the infection. Do not go barefoot in a locker room or a hotel bathroom. Keep the nails short and thinned. Many clinicians add a topical antifungal a couple of times a week indefinitely afterwards, and that is a reasonable thing to do.

If you have diabetes, peripheral neuropathy, peripheral arterial disease, or you are immunosuppressed, a fungal toenail is a foot-care problem rather than a cosmetic one, and it belongs with podiatry or your treating physician rather than starting here. We will say so at the consultation and refer, and we would rather lose the booking than be the reason a foot ulcer got missed.

Laser treatment is $150 a session. That is per visit for the nails being treated, not per nail. How many sessions are sensible — and whether laser is the right route at all — comes out of the consultation, and you will have the whole plan and its total in writing before anything is booked.

The consultation is free, and that includes the examination, the dermatoscopy, and the baseline photographs. You will have the full price of your plan in writing before anything is booked.

The confirmatory laboratory test is billed by the laboratory at the laboratory’s price, the way every lab we order is. Prescriptions we write are filled at your pharmacy at your pharmacy’s price. We do not mark up either, and we do not sell products here.

We are cash-pay and we do not bill insurance. Because this is treatment of a diagnosed infection rather than a cosmetic service, HSA and FSA cards work for it, and we will code the receipt accordingly.

One thing worth saying about cost that has nothing to do with our price list: a three-month course of generic terbinafine is inexpensive. If it turns out to be the right treatment for you, it will almost certainly cost you less than a series of laser sessions, and we would rather tell you that here than after you have paid us.