For nails that are thick and discolored, but fail to demonstrate the presence of fungus on a nail biopsy - Kera Nail Gel is recommended. This is a special formulation that has 47% urea, which acts to soften and even thin the nail. The color of your nails also tends to improve with use of Kera Nail Gel.  This is not a prescription, but is not available at the drug store and the cost is $35.

-Brittney C