Dear Dr. Roach: I have a serious problem with my fingernails splitting and coming off at the edges. I have tried biotin and keratin for almost a year without results. I am an 89-year-old man who takes ...

One day your manicure looks so good, you wonder if you’ve missed your calling as a hand model. The next day, you start to notice that your nails have started to split and peel. What’s going on? “The ...