If you have lost a permanent tooth or teeth due to an injury, periodontal disease, or other reasons, you have several options to consider for replacement. The easiest, it would seem, is to do nothing. This is the least advisable option in the dental field because it is important to replace a lost tooth to maintain maximum function, maintain alignment of surrounding teeth, and to preserve a healthy smile. If a missing tooth is not replaced, over time, the teeth adjacent to the space begin to drift into its place and move out of alignment affecting function and facial contour. Alignment changes can cause bite problems and Temporal Mandibular Joint dysfunction (TMJ).