When someone has crusty feet with beat up toe nails, they are white, dirty and dry.
They need a serious pedicure and a fair bit of lotion to just possibly fix the problem. In bad case a doctor may have to step in with medication to heal the cracks and crust in and on the foot with salves and such. Mostly happens with sandels or other open toed shoes...
Anyone can get it but mostly trashy people do.
In fact I actually threw up just a little bit thinking about sucking on her toes... IS that weird?