The best teeth are your own natural teeth. But sometimes, a tooth is badly damaged or lost. If a tooth is lost, it is important to replace it with an artificial tooth as soon as possible. This will prevent the teeth that are left from drifting out of line and possibly causing jaw problems. Teeth that are out of line are harder to clean and are more likely to get periodontal disease (gum disease) and cavities. If one or more of your teeth are missing, your dentist may suggest replacing your missing teeth with a bridge or a denture. If you need to have a tooth (or teeth) replaced, your dentist may do it, or he or she may refer you to a prosthodontist.