The science of tooth replacement is one that, like all medical science, is constantly in a stage of evolution, getting better and better with less and less negative side effects and complications. Until now, the best chance you had was to get a crown or a bridge to replace your missing tooth. This method allowed you to regain normal chewing function, but it cannot stop the disintegration of alveolar tissue, and thus could not prevent tooth loss. The problem is, when you lose a tooth, the tissue that supports teeth, the soft tissue in the gums, starts to disintegrate, and this will make the adjacent teeth loosen as well, and eventually the those will fall out too. So an artificial tooth root was invented partially by accident in the sixties, and this was known as the dental implant. Now the way we replace missing teeth is by anchoring the crown or bridge to the dental implant, and thus no alveolar tissue is lost.