The implants are left to heal, and then attached to teeth restorations such as dental crowns or a dental bridge. There are cases, however, when the placement of dental implants is very difficult or almost impossible to manage. This may be because of the compromised jawbone structure, as the bone undergoes deterioration due to tooth loss. In such cases, advanced techniques such as bone grafting and sinus grafting may be done to facilitate the successful placement of dental implants. Both techniques make it possible for those who have suffered from jawbone deterioration to still enjoy the benefits of a dental implant treatment.