There is a ticking clock that starts the minute you lose a tooth. Without the forces of chewing on that tooth, the body decides it no longer needs the supporting bone. If a bridge is a temporary solution for a missing tooth, what happens when you lose the next tooth, and the one after that? You have to start deciding what to do. Your options decrease as you lose bone structure, and you may not be happy with what you’re left with. A dental implant is the best insurance policy against losing your future dental options.
As mentioned earlier, your facial structure can change as you lose teeth. One generally won’t cause major changes, but more than that and you will see dramatic changes.