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Keeping your hands and nails moisturized may also help to protect your nails from breaking. Try to apply lotion after you wash your hands as well as any time they feel a little dry. Keep a bottle of hand lotion with you at all times, such as in your purse or on your desk. . Biting your nails can also introduce infection causing bacteria into the nail bed, so it is important to do what you can to quit biting your nails.Some things you can do to stop biting your nails include:  Applying a bitter tasting nail polish. Keeping your nails trimmed down. Finding something else to do with your hands, such as knitting or playing with a stress ball. Getting a manicure once per month. If your nails are constantly splitting and breaking no matter what you do, then it might be necessary to see a dermatologist. You may have an underlying problem that is causing this to happen. A dermatologist may be able to identify and treat the problem.
Apply lotion often. Avoid biting your nails See a dermatologist if your nails keep breaking.