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Experiments and experience have shown that implants work best if there is enough dense, healthy jawbone in a mouth that will support an implant. A healthy, disease-free gum tissues are also necessary. The long-term success of a dental implant depends on keeping the gums and its bone around the implant healthy. People who have implants must keep them clean and must return on a regular basis to their dentist for checkups, because any problems that might threaten the health of the implant must be corrected at once.

(Source:http://nemsi.uchc.edu/clinical_services/dental/dental_implants/about_implants.html#conditions)