Ten Bad Habits that Can Harm Your Teeth - Many daily habits that you wouldn't normally question may actually be harmful to your teeth! Dr. Elisa Mello, D.D.S., of NYC Smile Design warns patients of these habits, so you may avoid them in the future in an effort to maintain healthy teeth and gums in New York City. Some of the habits that Dr. Mello warns us about include sucking on lemons, jaw clenching and teeth grinding, crunching on ice, biting hard objects, such as glasses, pencils, and pens, biting nails, drinking soda, and using toothpicks. Each of these habits eventually causes damage to your teeth, enamel, and gums if repeated over an extended period of time. Avoid harmful habits, and let Dr. Mello of NYC Smile Design help you maintain a happy, healthy smile in New York.