PROTIP: Press 'i' to view the image gallery, 'v' to view the video gallery, or 'r' to view a random entry. Mountain Dew is a citrus-flavored soft drink distributed by PepsiCo Inc. and Doritos is a brand of chip distributed by Frito-Lay, which is owned by PepsiCo as well.
Other common things that can cause toenail fungus include: 1  Improper footwear, especially tight-fitting shoes. 2  Medical conditions such as diabetes and other circulatory conditions. 3  Toenail polish that is applied in layers.  Hosiery, socks, and shoes that do not allow the feet to breathe.
Yellow toenails usually results from fungal infection of the nails. Yellow toenails are usually due to fungal infection in the nails. The fungal infection of the nails is referred to as onychomycosis. The fungal infection of the toenails is more common than that of fingernails.