You only have 30 minutes left. Despite your best efforts, you find yourself running late due to standstill traffic on the freeway. As the minutes tick away, you realize you’ve been mindlessly biting your nails for the better part of an hour. “What’s the harm?” you think to yourself, “Nothing bad has ever happened before.” Just as the thought enters your head, you feel a surge of pain and notice a deep crack in your tooth.

Biting your nails is one of many behaviors that can harm your teeth. To keep your teeth strong and avoid an emergency dentist visit, watch out for these five bad dental habits.