As with most things they are never 100% guaranteed. But if patients are willing to care for them with regular dental check ups, interdental cleaning using floss, tepes etc then implants have a very high success rate. Dental implants have a higher failure rate with people with medical conditions such as diabetes , periodontal disease. Dental Implants may also fail because of poor oral hygiene. That is why it is vital to attend regular examinations with the dentist even after having the implant fixed.