Well, many experts agree that biting your nails is not great for your health, at least, with the most obvious reason being that our hands often touch unclean surfaces. Indeed, no matter how often you wash your hands, they can still transfer bacteria to your mouth. And as a result, the chances that you’ll catch a cold or other infection may increase.
Furthermore, if you bite too often, you can cause an infection of the skin surrounding your nails, too. Those with the habit know only too well how painful this can be: the skin turns red, swells and then just plain hurts.
And it gets worse. Have you ever bitten a nail near to a wart on your finger, for instance? Well, most people don’t realize that this increases the chances of warts spreading to other parts of your hand. Indeed, as Mayo Clinic dermatologist Dr. Rochelle Torgerson told The Huffington Post in 2014, “The more open skin you have, the more you’re going to spread [the virus that can lead to warts].”