Toenail fungus can be frustrating, persistent, and difficult to treat. What may begin as a small area of discoloration can gradually develop into a thick, brittle, yellow, white, or brown toenail that changes the appearance of the entire foot. For many people, over-the-counter products and home remedies do not provide the results they want, leading them to search for professional options for toenail fungus removal.

One treatment option that has attracted considerable attention is laser therapy. Toenail fungus laser treatments use specialized laser or light-based technology as part of an approach designed to improve the appearance of affected nails and, depending on the treatment plan and device, potentially address fungal involvement. Because different laser systems, treatment protocols, and patient circumstances can produce different outcomes, it is important to understand what laser treatment can and cannot be expected to do.

Toenail fungus, medically known as onychomycosis, is a fungal infection involving the nail or structures surrounding the nail. Fungal organisms can enter through small cracks in the nail, the skin around the nail, or other openings and gradually affect the nail plate.

Toenail fungus is common and can affect one toenail or multiple nails. It may occur at any age, although the risk tends to increase with age. People who frequently experience sweaty feet, wear enclosed footwear for long periods, visit communal showers or pools, or have certain medical conditions may have an increased risk.

Toenail fungus can develop slowly, and some people do not immediately notice that anything is wrong.

One of the earliest signs may be a small white or yellow area near the end or side of the toenail. Over time, the discoloration may become more noticeable.

Other possible signs include changes in:

An affected toenail may become yellow, white, brown, gray, or otherwise discolored.

The nail may become noticeably thicker than the other toenails. Thick nails can be more difficult to cut and may create pressure inside shoes.

The nail can become brittle, crumbly, rough, or uneven.

As the condition progresses, the nail may become distorted or irregular.

In some cases, part of the nail may separate from the nail bed.

Fungal involvement can be associated with buildup beneath the nail.

If you notice persistent nail changes, professional assessment is worthwhile rather than assuming that every abnormal-looking nail is fungal.

One of the biggest mistakes people can make is treating every discolored toenail as fungus.

A toenail may become discolored after an injury. Repeated pressure from shoes can also change nail appearance. Certain inflammatory skin conditions can affect nails. Other infections or disorders can create similar symptoms.

Because the treatment approach may differ depending on the cause, evaluation matters.

The American Academy of Dermatology explains that dermatologists may take a nail sample to help confirm fungal infection, particularly because other nail conditions can look like nail fungus.

The sensation associated with laser treatment can vary from person to person and depends on the laser system, settings, treatment area, and individual sensitivity.

Some patients may experience warmth, tingling, snapping, or brief discomfort during treatment.

Clinical research has reported pain or burning sensations in some laser studies, although these effects were generally described as tolerable in the reviewed research. 

Your provider should explain what you can expect before beginning treatment and discuss appropriate steps if you experience discomfort.