Lasers are used for everything from removing hair to clearing up the appearance of toenail fungus. Generally speaking, we support the use of lasers to clarify a fungus nail. It’s much more effective than the topical solutions out there, which only work eight to 10% of the time. It’s also less invasive than oral medication, which requires liver monitoring and may cause unpleasant side effects like the loss of taste. However, laser toenail fungus treatment isn’t for everyone. Here are some of the reasons why you may decide against it.