A dental implant is a replacement of a tooth root in the mouth. Like tooth roots, dental implants are secured in the jaw and are not visible once placed.  They are used to secure crowns (part of the teeth seen in the mouth), bridgework or dentures.  They are made of titanium, which is biocompatible and not rejected by the body.  Dental implants provide a foundation for replacement teeth that looks, feels and functions like natural teeth.