If the last tooth is a wisdom tooth, i.e. the third large tooth, it usually does not need to be restored. Most wisdom teeth do not erupt normally because of the gradual refinement of the modern diet and the gradual deterioration of the jawbone growth and development, and the relative lack of space for wisdom teeth to erupt. Even if they do erupt, the position is not particularly ideal and may affect oral health. Therefore, wisdom teeth are basically useless in the oral cavity and do not need to be restored. If the last tooth is the second largest tooth, it needs to be restored because failure to do so may have an impact on the opposing teeth. Because there is no occlusion and no blockage of the opposing tooth, it can lead to resorption and growth. In addition, missing teeth can become obsolete when not used for a long time. Also if the alveolar bone in this area is not used better, resorption of the alveolar bone can occur. The last missing tooth is clinically classified as free end missing, so the best restoration for free end missing is implant restoration.