Implants usually last a long time. When patients are missing all of their teeth, long-term studies (more than 30 years) show an 80 to 90 percent success rate. For patients missing one or several teeth, recent studies show a success rate of greater than 95 percent, which compares favorably with other areas in the body that receive implant replacement (such as hips or knees). However, if one of your dental implants either doesn’t heal properly or loosens after a period of time, you may need to have it removed. After the site heals (or on occasion at the time of removal), another implant usually can be placed.