Picking at your nose and mouth and biting your nails are already social faux pas. They can also be bad for your health. As you should already know, our hands are usually teeming with nasty germs. Putting your fingers in your nose or mouth — even to fish unwanted spinach out of your teeth — is a good way to give those germs easy access to your body. Nail biting, in particular, can also raise your risk of getting skin infections on your fingers and spreading warts to other parts of your hand. In some cases, excessive grooming behaviors are considered a mental disorder related to obsessive-compulsive disorders.
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