Whether they are due to periodontal disease or an accident, missing teeth can lower your self-confidence and prevent you from smiling in public. However, your appearance is not the only thing you have to worry about with missing teeth. If you do not replace your missing teeth, they can lead to a lot of different problems. Here are five consequences of having missing teeth: 5. Trouble Eating If you have several missing teeth, you will have trouble eating a lot of different foods including meat, nuts and vegetables.