4. Nail biting
The habit of using your teeth to cut your nails, whether due to extreme nervousness, also known as onchophagia, can pass germs into the body since the hands touch nearly everything. Even if you suds up your hands several times a day or lather on antibacterial lotion, germs sneak in. Nail biting can lead to repeated colds or flu and bacterial infections. Over time, gnawing your nails can put stress on your teeth, which can lead to crooked teeth or other dental problems. It can also lead to skin infections and aggravate the nail bed. So stop chomping and grab a nail clipper instead.
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