A common reason a dental implant may need to be replaced is because of poor oral hygiene habits that can lead to infection. However, according to one study age, length of the implant, the diameter of the implant, bone quality, and region of the implant are all factors that determine how long dental implants will survive.
Dental implants are grafted into the bone. Poor hygiene can cause gum disease which can lead to the loosening of the gum from the bone and undermine the implant.
When the implant is no longer supporting the tooth the whole dental implant may need to be extracted.