What Are Dental Implants? Dental Implants are substitute or replacement tooth roots. A tooth consists of a crown and a root. The crown is that part of the tooth which is visible in the mouth. The root is under the gum tissue, surrounded by the bone. The crown is supported by the root portion, which is attached to the bone. Implants are placed into the bone so that a prosthetic crown (the visible part of your tooth) can be firmly attached. State-of-the-art technology in implant dentistry makes it possible to provide replacement teeth that look, feel and function like natural teeth.