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Laser Treatment for Toenail Fungus — What to Expect

Reviewed by
Dr. Benjamin Weaver

Onychomycosis—or toenail fungus, as it is more commonly known—is an infection of the nail with dermatophytic fungi, associated with athlete’s foot (tinea pedis). The onset is often slow and asymptomatic. The infection will most commonly be found in the big toe (hallux), but in some cases all ten toes may be affected. Fortunately, laser treatment for toenail fungus is often effective.

Toenail Fungus Symptoms To Watch For

  • Yellow toenails
  • Hardened or thick toenails
  • Foul smells rising from toenail
  • Toenails that appear to be crumbling
  • Splitting of the nails
  • Pit marks on the nails
  • Tenderness in the toe
  • Pain
  • Appearance of debris build-up under the infected nail

What Causes Toenail Fungus?

Toenail fungus can be caused by many different things, including:

  • Improper footwear, especially tight-fitting shoes
  • Medical conditions such as diabetes, immune diseases, and other circulatory conditions
  • Unsanitary pedicures
  • Toenail polish that is applied in layers
  • Hyperhydrosis (excessive sweating) causing recurrent tinea pedis or “athlete’s foot” infections
  • Hosiery, socks, and shoes that do not allow the feet to breathe
  • Age

Fungal infections in the nails are typically caused by a group of fungi called dermatophytes, although yeasts and molds can also cause toenail fungus.

A person can contract toenail fungus by using shared showers, or in locker rooms, gyms, and other warm, damp places, including home showers that are shared by multiple family members.

What Are Dermatophytic Fungi?

Dermatophytic fungi live in warm, moist environments like showers, bathrooms, swimming pools, shared showers (i.e., dorm room showers) and gym locker rooms.

The fungi enter under the nail plate and feed off the keratin in the nail. They more commonly affect toenails than fingernails, and can be classified in the following groups:

  • Dermatophytes Trichophyton rubrum: found in approximately 70 percent of all cases
  • Trichophyton mentagrophytes: found in approximately 20 percent of all cases
  • Epidermophyton floccosum

Am I at Risk for Toenail Fungus?

It is estimated that 10–12 percent of the adult population is affected worldwide. Older people have a higher rate of onychomycosis, with an estimated 20 percent of the population aged 60+ and 50 percent of people aged 70+.

Onychomycosis is present in approximately one third of people with diabetes mellitus. It is a significant predictor of foot ulcers, and can be clinically serious.

How Is Toenail Fungus Treated?

Traditional methods of treatment include topical creams, lacquers, and oral medication.

Topical creams or lacquers are applied to the nail and surrounding skin daily. The success of these treatments is limited due to the difficulty of ensuring patient compliance and the creams’ limited ability to penetrate the nail bed effectively.

Oral medications have a higher success rate, but they are not without potential risks. Patients taking oral medication for toenail fungus should consult with their podiatrist about their alcohol intake and should have regular liver-function tests to ensure that their liver function isn’t adversely affected.

Laser technology has been used to treat toenail fungus for decades, but recent advances in lasers have prompted a significant increase in patient and physician demand for this procedure. Laser is fast becoming the preferred method of treatment because it is safe and effective, with a 70–100% reported success rate for mild to moderate onychomycosis.

Laser treatment for toenail fungus
Laser Spot

How Does Laser Treatment for Toenail Fungus Work?

Laser treatment for toenail fungus will take your doctor approximately twenty minutes to perform.

The treatment is very tolerable, requiring no anesthesia or numbing agent, and there is no downtime following the procedure.

Laser treatment for toenail fungus is a safe and effective procedure that does not require a lifestyle change or regular blood tests to monitor liver function. Unlike oral medications, laser therapy is targeted directly at the infection.

Unlike topical treatments, laser therapy is able to penetrate the nail plate to get to the fungus. After three to six months a healthy nail grows out.

Laser therapy works in a similar manner to how your body fights off an infection. If you become sick, your body develops a fever in order to raise your temperature to fight the viral infection. The same principle is used to treat toenail fungus with a laser.

The laser is directed at the nail to heat it up until the fungal spores are killed. This allows a new nail to grow out fungus-free.

What Will I Experience?

Fungal laser treatment is done in an office setting. Your nail polish will be removed, if you are wearing any. A temperature probe on the device will measure the temperature of the skin and nail.

Each nail needs to reach a certain temperature to properly treat the fungal infection. If the heat becomes too painful, your doctor will move on to the next nail.

Toenail Laser Treatment

You will be able to walk in and walk out the same day, with minimal pain from the procedure.

There is no need for any injections or anesthesia, as most people can handle the procedure quite well. The treatment takes only about twenty minutes.

Topical antifungal creams may be prescribed for any skin infection, and you may be given instructions for shoe sterilization. You can put on nail polish after only twenty-four hours.

You will be seen again by your doctor within four to six weeks for another treatment. Keep in mind that the nail grows slowly, and it may be over three months before you see results.

Laser Treatment for Toenail Fungus May Be for You If:

  • Your doctor has told you not to take medication because it could harm your liver
  • You have taken Lamisil before and the fungus has come back
  • You don’t want to take any more pills
  • You have tried multiple topical agents and they have failed
  • You are frustrated and embarrassed about how your nails look

Many patients find laser treatment to be a safe alternative to medications and topical treatments. It is not usually covered by insurance, and the cost is around $1,000. It usually takes two to four treatments to resolve the nail fungus.

Medical References:

    Thomas et al, J Clin Pharm Ther. 2010 Oct;35(5):497–519; Mayser et al, Am J Clin Dermatol. 2009;10(4):211–20 .; Winston & Miller, Clinical Diabetes, Volume 24, Number 4, 2006; McDonnell,; Kemna, J Am Acad Dermatol 1996; Iorizzo, Curr Opin Infect Dis 2007; NB Therapeutics; Topica Pharmaceuticals; IMS Health as cited by Anacor Pharmaceuticals, Halcygen, *GlobalData. Gupta A, Uro M, Cooper E. Onychomycosis Therapy: Past, Present and Future, Journal Drugs and Dermatology. 2010. Kozarev J, Dr. Evaluation of long pulse Nd: YAG laser therapy in treatment of onychomycosis, Journal of the Laser and Health Academy.

This page was last updated on January 1st, 2016

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