The mouth is also home to a lot of bacteria, some of which can cause a nail infection. Warts and herpes can also be transmitted from your mouth to your fingers and vice versa, Lipner says. “Almost the two dirtiest parts of your body are hanging out together as you bite your nails,”...
I admit I bite my nails, but only to keep them short when I don’t have a nail file handy. As soon as I find an emery board, I leave my cuticles well alone. Then again, I’m not talking about the occasional trimming of my nails by biting. This kind of nail biting smacks of ...