One possible complication is peri-implantitis which affects the gum tissue and bone surrounding the base of the implant. The condition is more likely to affect people who smoke, have a history of gum disease or suffer from improperly controlled diabetes. It is also more prevalent among those who do not practise good oral hygiene.
Similar to gum disease, peri-implantitis causes:
Bleeding may also occur when brushing the teeth and the implant may become loose if the condition is left untreated by a dentist. In the majority of cases, peri-implantitis can often be prevented by proper cleaning of the dental implant and following a good dental health regimen.
Any problems with, or concerns about, an implant should be discussed with the dentist as soon as possible in order to prevent losing the implant altogether. Read more about peri-implantitis at https://yourdentalhealthresource.com/what-is-peri-implantitis/