Losing a back tooth will darken your overall smile, making it look smaller and narrower. Your smile will appear to stop short, and the look will be exaggerated if your missing tooth has teeth on both sides of it. Function during chewing will be reduced and function of many teeth can be impacted by losing just one tooth. When you are missing a tooth, you compensate by chewing differently, which putts pressure on different parts of your mouth. This can cause your other teeth to shift, creating gaps and spaces that may eventually cause fractures that result in additional tooth loss or the need for restorations.