This is a typical question from patients with mild cases of toenail fungus:

"Hi Doc...

I have a mild case of toenail fungus. Only the big toenails have the white spots and thicker nail that suggests a toenail fungal infection. However my dad’s toes are a different story. 

We recently had a house call podiatrist come to the home to check his feet. When I saw my dad’s toes, I was horrified at the sight of his toenails!  All of his toenails are yellow, thick and curving in odd directions. The big toenails are incredibly thick...nearly as thick as the toes themselves. They are crusty and flaking as well. Dad said that his toenails are so thick he hasn’t been able to cut them himself for years.

The podiatrist told us that super-thick fungal toenails are really not that rare in elderly people. He said that the appearance of dad’s fungal toenails is characteristic of a longstanding toenail fungus infection. 

My question is, “How long will it take for my mildly infected fungal toenails to get as thick as my father’s fungal toenails?”

The rate at which toenail fungus gets worse depends upon the type of fungus that has infected the toenail and your body’s ability to fight and slow the infection. 

Fortunately the most common forms of toenail fungus are not caused by overly aggressive organisms. Trychophyton rubrum and Trychophyton mentagrophytes are responsible for most of the toenail fungus infections. There are some less common fungal organisms that progress rapidly, but again, those are rare.

If you are young, healthy, have good blood circulation in your feet and have a strong immune system, you should expect the common forms of toenail fungus to get worse very slowly...almost unnoticeably slowly. You won’t notice any change from day-to-day. In fact, you may not see a change from month-to-month. 

If you takes pictures every few months and then compare over a long period of time, you may gradually notice that the areas of white and yellow discoloration are getting bigger. This may be your only indication that the toenail fungus is spreading and getting worse. If the fungus goes untreated for a long period, you may even notice that the toenail is getting thicker as well. 

But even if you are healthy and have a strong immune system that is fighting the toenail fungus infection, don’t expect your immune system to win. Toenail fungus is not something that you “get over” the way you might get over a cold or a case of the flu. When toenail fungus gets inside the toenail and starts to grow it is there to stay...unless you treat it. If you don’t treat the fungus it will simply continue to grow. 

Over time the fungus spreads throughout the toenail. As the toenail fungus grows, it begins to separate the keratin that forms the toenail. The cracks and splits in the keratin change the way light refracts through the toenail. Once that happens you notice white or yellow areas of the toenail where the keratin has been infiltrated and damaged by the thriving fungus. 

If the toenail fungus does enough damage, the nail plate may become misshapen enough to actually separate from the underlying nail bed. This usually creates large opaque white spot because the pink skin of the nail bed is no longer flush against the undersurface of the toenail. When this happens, it is usually at the end of the toenail in one of the corners.

As the fungal infection continues to get worse, the fungus bores its way through the toenail, moving closer to the root of the nail or “matrix.”  The toenails grows directly outward from the matrix. The matrix is the same size, same thickness and same curvature as a cross section of the toenail. 

If the fungus thickens the toenail and stretches out the matrix, the damage is permanent. At that point, even after you remove the fungus from the toenail, the matrix is permanently deformed and the toenail will always grow out thicker. 

If your immune system has been weakened by chronic disease, malnutrition, HIV infection or over-training, the fungus can grow and spread at a much faster rate. 

So, back to the real question. How long does it take for toenail fungus to become irreparably damaged and terribly thickened?

In many young healthy adults toenail fungus will worsen over the course of a year before the problem seems noticeable. In five years the common forms of toenail fungus can form substantial thickening and possibly permanent damage to the nail plate. But it may take ten years of more to develop the kind of grossly deformed thickened toenails like your father. The fact is, given what you describe, your father has likely had toenail fungus for decades. 

Dr. Christopher Segler offers concierge laser toenail fungus treatment services in San Francisco, Marin and Silicon Valley. If you have toenail fungus he will bring the laser directly to you.  If you have a question about laser treatment of toenail fungus, you can reach him directly at 415-308-0833.

A normal toenail is clear and healthy. It is smooth and uniform in color. But the toenail changes when it gets infected with fungus. All it takes is for your toenail to bump up against the inside of the shoe and get some of the fungal spores up under the toenail where they start to grow.  The growing fungus separates the layers of the keratin within the toenail making the toenail thicker. This causes the ugly discoloration that you see.

During the laser toenail fungus removal treatment, the doctor moves the laser in a grid pattern over the surface of the toenail to make sure that the laser kills ALL of the fungus infecting the toenail. All you will see during the procedure is an aiming light that tells the doctor where the laser is penetrating the toenail. But the laser is actually going all the way through the toenail to destroy the fungus.

In this video you can see the aiming light passing over the surface of the nail while the doctor is treating the toenail to remove the fungus during an actual treatment. The only thing you feel during the procedure is a little bit of heat that is generated by the laser light energy. 

Although the laser completely kills the fungus, the appearance of the toenail does not actually change at all during the laser procedure. Even though the fungus is dead, you have to wait for the toenail to grow out and become clear again. As the toenail grows you will trim off the thick discolored unhealthy toenail that was damaged by the toenail fungus and your nails gradually become clear.

If you have a toenail that you think might be infected with fungus you can call our doctor or even send a picture of the toenail to us so that we can discuss whether or not laser treatment might help you have clear toenails again. 

Dr. Christopher Segler is Board Certified, American Board of Podiatric Medicine. He can actually bring the laser out to your home or office to perform the laser fungus removal treatment in the morning before you leave for  work, during the day, in the evenings or on weekends. Call him directly to schedule your laser treatment at 415-308-0833. We perform podiatry house calls in San Francisco, Berkeley, Oakland, San Mateo and Mill Valley.

This video explains how clear toenails turn into discolored fungal toenails.

A normal toenail is thin, clear and translucent allowing you to actually see right through the toenail to the pink nail bed underneath. However as soon as the fungal spores get in underneath the toenail the toenail fungus starts to grow within the keratin of the toenail itself. The growing fungus actually causes the layers of keratin to separate.

The separation of layers within the toenail causes the toenail to become thicker but it also changes the way that light refracts through the toenail. This causes a cloudy discoloration that is usually white or yellowish. Those thick, crumbling white and yellow areas of the toenail are the classic signs of a toenail fungus infection.

If you think you might have a toenail fungus infection, you can call 415-308-0833 to speak to an expert to find out if you might be able to get rid of the toenail fungus and have clear toenails again.