Toes can get really gross. This should surprise no one. Everyone has been to a public pool or seen their dad wandering the house without socks.
Yellowing, brittle toenails aren't something anyone wants, but, as Today I Found Out points out in a new video, it's fairly common. It's called onychomycosis, and it impacts about 10% of the population. As you age, the number increases. It affects 20% of people over 60 and 50% of people over 70.
Common symptoms, according to the Mayo Clinic, include nails with a yellow or whitish coloring, thickening, crumbling around the edges, distorted shape, and an unpleasant smell.